P2CC7
Moderate Severity (Level 3)Generator Inverter Power Supply B Circuit High
P2CC7 usually means generator Inverter Power Supply B Circuit High.
Can you still drive with P2CC7?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $200 – $700
Severity Level 3 — Moderate
This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.
Common Symptoms
- Battery/charging reading abnormally high or staying at maximum
- Engine may run rich or have poor fuel economy (PCM sees faulty signal)
- Check Engine Light illuminated
- Diagnostic trouble code (DTC) stored in module memory
Possible Causes
- Failed alternator — internal short causing abnormally high voltage signal to the control module
- Wiring shorted to a 5V reference or 12V power wire in the same harness — wires melted together or chafing at a common point
- Poor ground connection for the alternator/generator system — high resistance in ground path causes voltage to read high
- Faulty voltage regulator or power supply within the alternator
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($35-95 at shop, free at auto parts store for basic scan)
- Visually inspect the alternator/generator system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $92 diagnostic fee at shop)
- Test alternator with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace alternator ($200-700)
- Check the reference voltage supply to alternator — should be steady 5V (or 12V) — if low, trace back to PCM/BCM voltage regulator ($141-579 if module repair needed)
- Perform a voltage drop test on the ground side of the alternator/generator system circuit — more than 0.1V drop means a bad ground that must be cleaned/repaired ($91-219 at shop)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does P2CC7 mean?
P2CC7 stands for "Generator Inverter Power Supply B Circuit High". P2CC7 usually means generator Inverter Power Supply B Circuit High.
Can you drive with P2CC7?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix P2CC7?
Repair costs for P2CC7 typically range from $200 to $700, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($35-95 at shop, free at auto parts store for basic scan); Visually inspect the alternator/generator system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $92 diagnostic fee at shop); Test alternator with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace alternator ($200-700).
Will P2CC7 clear itself?
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