P0CE6: Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit Low

P0CE6 reports that the position feedback of the battery coolant control valve has fallen below its permitted window. GM expresses the signal relative to the reference voltage: the 2011 Chevrolet Volt fails it below 5 % in 40 of 50 samples at 100 ms, the 2016 Cadillac ELR below 28 % in 640 of 800 samples at 6.25 ms, a value under the lowest end stop the ELR accepts during learning (just over 30 %). Both are Type B, so the MIL comes on after two trips, and while the code is active the valve performance test is suspended. A short of the signal wire to ground, a missing reference voltage or a defective sensor track in the actuator are the likely causes. The controller can then no longer position the valve reliably. The high fault is P0CE7, plausibility P0CE5.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

MIL after two trips (GM)
Valve position shown as near 0 % in live data

Most likely causes

Feedback signal wire shorted to ground
Sensor reference voltage missing or open
Worn or defective sensor track in the actuator

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
With the connector unplugged, check whether the signal wire is making contact with ground.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P0CE6 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
E6: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0CE6?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0CE6?

The most common causes are: feedback signal wire shorted to ground; sensor reference voltage missing or open; worn or defective sensor track in the actuator.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.