P0CE2: Hybrid/EV Battery Pack Coolant Control Valve A Control Circuit Low

P0CE2 points to a ground short on the drive circuit of coolant control valve A. In the 2011 Chevrolet Volt and 2016 Cadillac ELR, GM's four-port battery valve is moved by a small motor with two driver lines. The hybrid controller sets P0CE2 when driver line 1 reads low while the valve should be travelling in reverse, with system voltage above 9 V (2011) or 10.2 V (2016); 90 failed samples out of 100 at 6.25 ms create a Type B code, so the MIL comes on after two trips. As long as it is active, the valve performance test is blocked. Typical findings are a wire chafed against the body, water in the connector or an internal short in the valve motor. With the valve stuck in its last position, battery cooling or heating may be restricted. Short to voltage is P0CE3, open circuit P0CDF.

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 does not move, battery thermal conditioning limited

Most likely causes

Driver wire chafed through and shorted to ground
Water or corrosion in the valve connector
Valve actuator motor internally shorted

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 P0CE2 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
E2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0CE2?

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 P0CE2?

The most common causes are: driver wire chafed through and shorted to ground; water or corrosion in the valve connector; valve actuator motor internally shorted.

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.