Diagnostic Tips

SPS Programming Issues / No Communication / IPC Gauges Erratic / Various IPC Warning MILs / Certain Cruise Control Speeds Will Not Set / Communication DTCs – 2019-2022 Chevrolet Silverado & GMC Sierra

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2022 Chevrolet Silverado 1500

NHTSA ID Number: 10202392 Manufacturer Communication Number: PIT5752B Summary This Preliminary information communicates multiple vehicle issues caused by an aftermarket device and it gives dealership information where to inspect for this device.   Condition You may encounter any of the following issues: IPC warning lights or messages IPC gauges erratic Cruise control may not set or not … Read more

Wipers Only Operate On One Speed – 2021 Buick Envision

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2021 Buick Envision

NHTSA ID Number: 10202394 Manufacturer Communication Number: PIT5852 Summary This Preliminary information communicates a condition where the wipers will be stuck on one speed.   Condition Wipers only operate on one speed and unable to change wiper speeds   Cause Logic locked   Correction: Place wiper stalk switch to the off position. Disconnect the battery and wait … Read more

Service Leveling System/Speed Limited Message Due to Aftermarket Modifications – 2021 Cadillac Chevrolet GMC

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NHTSA ID Number: 10202399 Manufacturer Communication Number: PIT5854 Summary This Preliminary information communicates information on vehicle speed being limited due to aftermarket lower kit being installed on the vehicle.   Condition Some customers may comment on a Service Leveling System/Speed Limited message on DIC. Dealers may find no DTC’s present.   Cause This could be caused by … Read more

HFV6 Engine Misfire On AFM Cylinders 2 or 5 – 2021 Cadillac Chevrolet GMC

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NHTSA ID Number: 10202400 Manufacturer Communication Number: PIP5824 Summary This Preliminary information communicates a possible issue with the active fuel management rockers causing a misfire and the correction for this concern.   Condition A 2021 vehicle equipped with a HFV6 Gen2 engine with AFM may be brought into the dealership with misfires on cylinder 2 or 5. … Read more

Intermittent Extended Crank No Start – 2021 Cadillac Chevrolet GMC

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NHTSA ID Number: 10202402 Manufacturer Communication Number: PIP5823 Summary This Preliminary information communicates to technicians the need to reprogram the ECM for an intermittent crank/no start concern.   Condition: Some customers may experience an intermittent extended crank or intermittent no start. The vehicle will crank for 15 seconds until it times out. The vehicle will start on … Read more