Some electronics coolant pumps receive two signals: a speed command and a separate enable wire that switches the pump on. P0CED concerns that enable wire. In GM's 2011 Volt (11OBDG01) any open or short on it sets the code after 16 of 20 samples at 250 ms with more than 9 V supply, Type B, two trips. Later GM controllers split the short cases into their own codes and keep P0CED for an open: the HPC2 tables 16OBDG02 and 19OBDG02 fail it when, with enable commanded on, the line rests between 1.14 V and 2.81 V, a level that points to a floating wire. The speed command line itself is P0CE9 to P0CEC. Without enable the pump stays off even though its command looks normal, so electronics temperatures climb and power may be reduced.
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
- Malfunction indicator lamp on
- Electronics coolant pump remains off
- Reduced power or charging rate when electronics get warm
Most likely causes
- Broken enable wire or terminal pushed out of the connector
- Enable wire shorted to ground or voltage (codes it on older GM controllers)
- Defective enable input inside the pump
- Faulty enable driver in the control module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P0CED means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- C: Subsystem depends on the code range
- ED: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0CED?
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 P0CED?
The most common causes are: broken enable wire or terminal pushed out of the connector; enable wire shorted to ground or voltage (codes it on older GM controllers); defective enable input inside the pump.
Related codes
- P0CE9Hybrid/EV Electronics Coolant Pump A Control Circuit/Open
- P0CEAHybrid/EV Electronics Coolant Pump A Performance
- P0CEBHybrid/EV Electronics Coolant Pump A Control Circuit Low
- P0CECHybrid/EV Electronics Coolant Pump A Control Circuit High
- P2E45Hybrid/EV Electronics Coolant Pump B Enable Circuit
Sources
- gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
- gsi.ext.gm.com: 16OBDG02 Hybrid Diagnostics
- gsi.ext.gm.com: 19OBDG02 Hybrid Diagnostics
- law.cornell.edu: 13 CCR 1968.2
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.