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.
DTC 51 - Prom Problem (Faulty Or Incorrect Prom)
Ensure all pins are fully inserted in socket. If pins are fully inserted, replace PROM, clear memory and recheck. If DTC 51 resets, replace PCM. If PCM is faulty and must be replaced, TDC OFFSET must be programmed into the new PCM. When all diagnosis and repairs are complete, clear DTC's and verify for proper operation.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.