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Reliability

Code P062B: GM's fix for a check engine light and no-start on gas Cadillacs

A GM bulletin revised in October covers code P062B on 2023-2026 Escalade, CT4, CT5, XT4, XT5 and XT6 models. Software and a reset usually fix it; some need a new engine computer.

Dashbird NewsroomUpdated 3 min read

General Motors has revised a dealer bulletin that covers a check engine light, and in some cases an engine that cranks but will not start, on most of Cadillac's gas models from 2023 on. The document, preliminary information PIT6110L, was filed with the National Highway Traffic Safety Administration on October 14, 2026. It centers on trouble code P062B stored in the engine control module, and its latest version, dated October 7, changes how dealers can bill the repair.

Which Cadillacs it covers

  • 2023-2026 Escalade and Escalade ESV with V8 engines
  • 2023-2026 CT4 with the 2.0-liter turbo (LSY) or 2.7-liter turbo (L3B)
  • 2023-2026 CT5 with the 2.0-liter turbo (LSY) or the supercharged 6.2-liter V8 (LT4) of the CT5-V Blackwing
  • 2023-2025 XT4, 2023-2026 XT5 and 2023-2025 XT6 with the 2.0-liter turbo (LSY)

The same bulletin lists Buick, Chevrolet and GMC models from those years, from the Blazer to the Silverado and Tahoe, which share the same family of engine computers.

What P062B means

P062B is a generic code, defined the same way across makes, for a fault the engine computer finds in its own control of the fuel injectors. RepairPal describes it as the computer losing control of injector operation because of an internal fault. GM says owners may see the Service Engine Soon light, and some will have a crank-no-start.

GM's engineers are still investigating and say a design improvement is in the works. In the meantime, the bulletin gives technicians a sequence that GM says usually solves the problem:

  1. Run the standard circuit and system checks for the code.
  2. Make sure the engine control module has the latest software.
  3. Clear all codes, disconnect the 12-volt battery for several minutes, reconnect it and confirm the code stays away.
  4. If the code comes straight back, the engine control module may need replacing.
  5. If it does not return, GM says it was set falsely and nothing more is needed for now.

GM adds that low voltage at startup, or during an automatic stop/start event, can set the same code, and that any low-voltage problem should be fixed. A tired 12-volt battery is therefore part of the diagnosis.

What changed in October

The bulletin dates back to January 2024, and GM has revised it 11 times as it added models and refined the steps. The October 7 change rewrote the warranty section. It now gives dealers labor guidance for repairs under the bumper-to-bumper warranty and, separately, for repairs under emission coverage. The second matters for older cars.

Cadillac's bumper-to-bumper warranty runs four years or 50,000 miles. Separately, the federal Clean Air Act requires automakers to warrant three parts, the catalytic converter, the electronic emissions control unit and the onboard emissions diagnostic device, for 8 years or 80,000 miles. The engine control module is the computer that runs the emissions controls, and GM's revised bulletin now gives dealers a way to bill this repair under emission coverage. A 2023 Cadillac past its bumper-to-bumper warranty may still have the work covered.

Owner brief

What it means for owners

  • Who is affected: owners of the models above with a check engine light, particularly one that arrived with a hard start or a no-start.
  • Know the code. P062B is the one this bulletin covers. If other codes are stored as well, the bulletin may not be the whole story.
  • Test the battery. Because low voltage can set the code, a battery check is a sensible and cheap first step.
  • At the dealer: mention bulletin PIT6110L. Expect a software check and reset first. A new engine computer comes only if the code returns quickly.
  • Past four years or 50,000 miles? Ask the dealer whether the repair qualifies for emission coverage, which federal law sets at 8 years or 80,000 miles for the emissions control unit.
  • Not a recall. There will be no letter. You can still check your VIN for open recalls at nhtsa.gov/recalls.

Dashbird tip

If the check engine light comes on, plug in Dashbird to see whether the stored code is P062B, explained in plain English, before you book the dealer visit.

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