P0CEDHybrid/EV Electronics Coolant Pump A Enable Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- Electronics coolant pump remains off
- Reduced power or charging rate when electronics get warm
- Likely causes
- LikelyBroken enable wire or terminal pushed out of the connector
- PossibleEnable wire shorted to ground or voltage (codes it on older GM controllers)
- RareDefective enable input inside the pump
- RareFaulty enable driver in the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.