P0C70Hybrid/EV Battery Temperature Sensor C/D Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C70 is the correlation check between battery temperature sensors C and D. The controller expects both to settle at nearly the same value once the pack has rested, and it stores the code when their difference stays too large. No manufacturer documents P0C70 publicly. Where GM and Mitsubishi publish this monitor, they compare each sensor with the pack average and name the single sensor; GM's sensor 4 code P0AE9 is the D counterpart. Before replacing parts it is worth knowing that GM cured false sets of these Volt sensor codes, shown with a battery-too-cold message, by reprogramming the module (18-NA-342). Genuine faults are a drifting thermistor, a sensor that lost contact with its cells, or uneven cooling. The battery controller usually limits power. P0C71 continues with D/E.
- What you may notice
- Malfunction indicator lamp or EV system warning
- Message asking to plug in or warm the battery
- Reduced electric power and slower charging
- Likely causes
- LikelyThermistor C or D drifted out of agreement with the other
- PossibleBattery control software that sets the code falsely, for example in cold weather
- PossibleSensor C or D detached from its cell group
- RareUneven cooling across the pack, such as a blocked air duct or coolant channel
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.