Special Coverage Adjustment – Engine Balance Chain and Fuel Pump – 2010-2011 Buick Chevrolet GMC

SEOCONTENT-START

Bulletin No.: 12313D
Date: June 2017

Subject:	12313D – Special Coverage Adjustment – Engine Balance Chain and Fuel Pump
Models:	2010-2011 Buick LaCrosse
	2011 Buick Regal
	2010-2011 Chevrolet Equinox
	2010-2011 GMC Terrain
	Equipped with 2.4L Engine (LAF)

This bulletin has been revised to add two part numbers to the part information section, include a new add condition in the warranty transaction information section to replace the fuel pump, and to update the service procedure to clarify the appropriate procedure to follow depending upon vehicle model. Please discard all copies of bulletin 12313C.

Condition

On some 2010-2011 model year Buick LaCrosse, Chevrolet Equinox, and GMC Terrain; and 2011 model year Buick Regal vehicles, equipped with a 2.4L engine (LAF), the chrome layer on the balance chain pins may wear, allowing the chain to stretch. This would cause an engine noise, and if left untreated, could cause the chain to break, leading to engine damage.

Special Coverage Adjustment

This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. Dealers are to replace the engine balance chain. The repairs will be made at no charge to the customer. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after July 16, 2013, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to July 16, 2013, must be submitted to the Service Contract provider.

Vehicles Involved

All involved vehicles are identified by Vehicle Identification Number on the Applicable Warranties section in GM Global Warranty Management system. Dealership service personnel should always check this site to confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is important to routinely use this tool to verify eligibility because not all similar vehicles may be involved regardless of description or option content.

Parts Information

Parts required to complete this special coverage are to be obtained from General Motors Customer Care and Aftersales (GMCC&A).

Description	Quantity/ Vehicle	Part Number
CHAIN, W/PMP & BAL SHF	1	12635427 GM Genuine Parts 12635427 Water Pump and Balance Shaft Chain Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type GM regularly updates production and service part designs to integrate new materials and technologies Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
TENSIONER, W/PMP & BAL SHF CHAIN	1	12649233 Sale 43 Reviews ACDelco GM Original Equipment 12649233 Engine Balance Shaft Chain Tensioner Applies pre-set tension to the balance shaft chain to help prevent unnecessary balance shaft noise, engine vibration, and component wear GM-recommended replacement part for your GM vehicle’s original factory component Offering the quality, reliability, and durability of GM OE Manufactured to GM OE specification for fit, form, and function $43.24 −$5.56 $37.68 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
GASKET, ENG FRT CVR	1	24435052 Genuine GM Parts - (S Gasket (24435052) 24435052 (S)Gasket Genuine GM Parts Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
PUMP, FUEL(HIGH PRESSURE)	1	12641847 GM Genuine Parts EP1028 (12641847) Fuel Pump (High Pressure) Helps provide a steady, reliable supply of fuel for your vehicle's engine Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle GM regularly updates production and service part designs to integrate new materials and technologies. Vehicle Fitment-Buick-Allure 2010, Lacrosse 2010-2016, Regal 2011-2017, Verano 2012-2017. Chevy-Captiva 2012-2015, Equinox 2010-2013, 2015, 2017, Impala 2014, Malibu 2013-2014, Orlando 2012-2014. GMC- Terrain 2011, 2015-2017 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API
PIPE ,FUEL FEED INTER	1	12608374 GM Pipe GM Pipe $83.92 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API
SEAL, O/PMP HSG(O RING)	1	12584041 10 Reviews Genuine GM 12584041 Crankshaft Oil Seal, Front $14.75 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
GASKET KIT, CM/SHF CVR	1	12609291 GM Gasket Kit - 12609291 Equinox, Terrain. Captiva Sport. Solstice. LaCrosse. Malibu. Impala. Cobalt. Verano. Regal. HHR. Sky. 2.4L. 2.0L turbocharged. Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
BOLT, HFH,W/CON WA	1	11589123 General Motors, BOLT, 11589123 Coupe, 2.2L. Coupe, 2.4L. Sedan, 2.2L. 2.0L turbocharged. 2.0L supercharged. 2.0L turbo, 2011-2013. $19.99 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
BOLT, CM/SHF POSN ACTR	2	11588844 2 Reviews GM Bolt GM Bolt $9.99 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-13 / Affiliate links / Images from Amazon Product Advertising API
FILTER,OIL	1	12605566 ACDelco GM Original Equipment PF457G (12605566) Engine Oil Filter Helps keep abrasive particles away from bearings and other engine hydraulic components Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle GM regularly updates production and service part designs to integrate new materials and technologies $7.21 Buy on Amazon Price incl. tax, excl. shipping Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API
OIL, ENG (DEXOS 1)(5W30)	5	19293000 No products found.

Note: Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which parts to order.

Reminder: Parts may be removed from Retail Inventory Management (RIM) management. Dealers should review the affected parts to confirm RIM managed status. Parts may have quantity limiters in effect.

Service Procedure

This service procedure is broken into sections by vehicle model. Depending on vehicle model, follow the appropriate service procedure.

Chevrolet Equinox and GMC Terrain

Note: Listen to the engine to determine if abnormal engine noise is present. Use a scan tool to identify set diagnostic trouble codes (DTCs). Review relevant engine technical service bulletin and preliminary bulletin information to aid in diagnosis.

1. Determine if field action bulletin 12312 has been completed.
   • If field action bulletin 12312 has been completed, proceed to step 2.
   • If field action bulletin 12312 has NOT been completed, complete field action bulletin 12312 and then proceed to step 2.
2. Determine if the balance shaft chain requires replacement by using diagnostic information in SI, a scan tool, and customer-provided information.
   • If diagnostic information indicates that the balance shaft chain must be replaced, replace the balance shaft chain. Refer to Water Pump and Balance Shaft Chain Replacement in SI.
   • If diagnostic information indicates that the balance chain does NOT require replacement, no further action is required. Repairs and diagnostic time for service issues other than balance shaft chain replacement are NOT covered under this field action.
3. Drain engine oil and remove engine oil filter. Refer to Engine Oil and Oil Filter Replacement in SI.
4. Install a new engine oil filter and fill engine with engine oil. Refer to Engine Oil and Oil Filter Replacement in SI.

Buick LaCrosse and Regal

Note: Listen to the engine to determine if abnormal engine noise is present. Use a scan tool to identify set diagnostic trouble codes (DTCs). Review relevant engine technical service bulletin and preliminary bulletin information to aid in diagnosis.

1. Determine if field action bulletin 12312 has been completed.
   • If field action bulletin 12312 has been completed, proceed to step 2.
   • If field action bulletin 12312 has NOT been completed, complete field action bulletin 12312 and then proceed to step 2.
2. Determine if the fuel pump requires replacement by using diagnostic information in SI, a scan tool, and customer-provided information.
   • If diagnostic information indicates that the fuel pump must be replaced, replace the fuel pump. In addition, replace the balance shaft chain if the vehicle was built BEFORE 3/1/2011 and/or the balance chain was replaced ON or BEFORE 5/1/2011. Refer to step 4 and, if necessary, step 5.
   • If diagnostic information indicates that fuel pump does NOT require replacement, proceed to step 3.
3. Determine if the balance shaft chain requires replacement by using diagnostic information in SI, a scan tool, and customer-provided information.
   • If diagnostic information indicates that the balance shaft chain must be replaced, replace the balance shaft chain. In addition, replace the fuel pump if the vehicle was built BEFORE 2/1/2011 and/or the fuel pump was replaced ON or BEFORE 3/1/2011. Refer to step 5 and, if necessary, step 4.
   • If diagnostic information indicates that the balance chain does NOT require replacement, no further action is required. Repairs and diagnostic time for service issues other than fuel pump and balance shaft chain replacement are NOT covered under this field action.
4. Replace the fuel pump. Refer to Fuel Pump Replacement in SI.
5. Replace the balance shaft chain. Refer to Water Pump and Balance Shaft Chain Replacement in SI.
6. Drain engine oil and remove engine oil filter. Refer to Engine Oil and Oil Filter Replacement in SI.
7. Install a new engine oil filter and fill engine with engine oil. Refer to Engine Oil and Oil Filter Replacement in SI.

Customer Reimbursement – For Canada and Export

Customer requests for reimbursement of previously paid repairs to correct the condition described in this bulletin are to be submitted to the dealer prior to or by July 31, 2014. Repairs must have occurred within the 10 years of the date the vehicle was originally placed in service, or 193,000 kilometers, whichever occurs first.

When a customer requests reimbursement, they must provide the following:

• Proof of ownership at time of repair.
• Original paid receipt confirming the amount of unreimbursed repair expense(s) (including Service Contract deductibles), a description of the repair, and the person or entity performing the repair.

All reasonable and customary costs to correct the condition described in this bulletin should be considered for reimbursement. Any questions or concerns should be reviewed with your GM representative prior to processing the request.

Courtesy Transportation – For US and Canada

The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.

Warranty Transaction Information

Submit a transaction using the table below. All transactions should be submitted as a ZREG transaction type, unless noted otherwise.

* The amount identified in “Net Item” should represent the dollar amount reimbursed to the customer.

Customer Notification

General Motors will notify customers of this special coverage on their vehicles (see copy of typical customer letter included with this bulletin – actual divisional letter may vary slightly).

July 2013

Dear General Motors Customer:

As the owner of a 2010 or 2011 model year Buick LaCrosse, Chevrolet Equinox, or GMC Terrain; or 2011 model year Buick Regal, your satisfaction with our product is very important to us.

This letter is intended to make you aware that on some 2010 and 2011 model year Buick LaCrosse, Chevrolet Equinox, and GMC Terrain vehicles; and 2011 model year Buick Regal vehicles, equipped with a 2.4L engine, the chrome layer on the balance chain pins may wear, allowing the chain to stretch. This would cause an engine noise, and if left untreated, could cause the chain to break, leading to engine damage.

In addition, the fuel pump plunger shaft seal may wear and allow fuel to leak into the crankcase, which would illuminate the Malfunction Indicator Light. This can cause engine run-on and/or the engine to run rough.

Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the condition as described above.

What We Have Done: General Motors is providing owners with additional protection for the condition described above. If this condition occurs on your 2010 or 2011 model year Buick LaCrosse, Chevrolet Equinox, or GMC Terrain; or 2011 model year Buick Regal, equipped with a 2.4L engine, within 10 years of the date your vehicle was originally placed in service or 120,000 miles (193,000 km), whichever occurs first, the condition will be repaired for you at no charge. Diagnosis or repair for conditions other than the condition described above is not covered under this special coverage program.

What You Should Do: If you believe that your vehicle has the condition described above, repairs and adjustments qualifying under this special coverage must be performed by a General Motors dealer. You may want to contact your GM dealer to find out how long they will need to have your vehicle so that you may schedule the appointment at a time that is convenient for you. This will also allow your dealer to order parts if they are not already in stock. Keep this letter with your other important glove box literature for future reference.

Reimbursement: If you have paid for repairs for the condition described in this letter, please complete the enclosed form and present it to your dealer with all required documents. Working with your dealer will expedite your request, however, if this is not convenient, you may mail the completed form and all required documents to Reimbursement Department, PO Box 33170, Detroit, MI 48232-5170. The completed form and required documents must be presented to your dealer or received by the Reimbursement Department by July 31, 2014, unless state law specifies a longer reimbursement period.

If you have any questions or need any assistance, just contact your dealer or the appropriate Customer Assistance Center at the number listed below.

We are sorry for any inconvenience you may experience; however we have taken this action in the interest of your continued satisfaction with our products.

Jim Moloney
General Director,
Customer and Relationship Services

Enclosure
12313

SEOCONTENT-END