Powertrain, generic (extended)

P2CC1 Generator Voltage Sense Circuit B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2CC1 is the general fault of a second sense line through which the engine controller reads the actual charging voltage. In the charging system, generator means the alternator; a sense input taps the voltage at the rectifier or battery without load current, so wiring losses do not distort it. Remy describes such a Kelvin sense lead on Chrysler alternators, connected straight to the rectifier plate behind a 2.4 kΩ protective resistor; that terminal is labelled B, which is not the circuit letter of this code. A circuit B is presumably needed only where a second alternator or measuring point exists. No manufacturer documents P2CC1 publicly; Deutz, for example, lists only circuit A codes (P063A, P063C, P063D) for its alternator. Range, low and high: P2CC2 to P2CC4.

Likely causes

Sense wire B, its fuse or connector open or corroded
Second alternator or its regulator faulty
Sense input in the engine control module faulty

Symptoms

  • Battery or charging warning lamp on
  • Charging voltage regulated to a fixed or unsuitable value

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator voltage sense circuitalternatorwiring harness

Related codes

P2CC2P2CC3P2CC4P063AP0562P0563

References: autoprollc.com, serdia.deutz.com, law.cornell.edu.