Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Tests DP: Powertrain Control Module (Pcm) Vehicle Speed: Introduction
The vehicle has three methods of calculating vehicle speed:
- from the anti-lock brake system (ABS)
- from the transmission control module (TCM)
- from the PCM engine speed and the TCM generator speed
This pinpoint test is intended to determine which of the three vehicle speed inputs caused the PCM vehicle speed diagnostic trouble code (DTC).
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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