P061C

Internal Control Module Engine RPM Performance

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–222 (est.)

Symptoms

The Check Engine light comes on
Unstable engine speed, random fluctuations
Misfire
Incorrect automatic transmission control (depending on speed)
Difficult start in combination with other codes

Causes

Internal RPM signal processing error in the ECU
Noisy crankshaft position (CKP) sensor signal
Malfunction of the ADC in the CKP sensor circuit in the ECU
Interference from ignition or generator systems
Physical ECU malfunction

How to Fix

Check for additional codes P0335/P0336 (CKP sensor)
Check the gap and condition of the crankshaft position sensor
Check the drive disk (ring gear) for damage to the teeth
Check the shielding and cable routing of the CKP sensor
Diagnostics of the CKP signal with an oscilloscope
If the sensor is working - ECU diagnostics

Related codes

P0335 P0336 P061A P061B P0606