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 P16C0: Powertrain Control Module (PCM) A/T Control System Incomplete Update: General Description
The control program in the powertrain control module (PCM) has a rewriting function that can be done in the field. The program in the CPU is classified into a powertrain control program (re-writable program) and a program for the rewrite function (non-re-writable program), and the program rewrite function only rewrites the powertrain control program.
When the program rewriting process is not finished normally due to an irregular process, such as turning off the PCM power during the A/T CPU re-writing process, and the ignition switch is turned on again, the A/T CPU starts according to the rewriting function program, and this DTC is sent to the FI CPU via serial communication and stored in the PCM.
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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.