Pinpoint Test O : Insufficient Heat In Auto Start-Stop Mode Only: Notes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Manual Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
Cabin Heater Coolant Pump, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2600 | Coolant Pump "A" Control Circuit/Open | This DTC sets when the PCM senses an open circuit to the cabin heater coolant pump. |
| P2601 | Coolant Pump "A" Control Circuit Performance/Stuck Off | This DTC sets when the PCM senses any of the following conditions: Dry-run leads to cabin heater coolant pump running without resistance Over temperature Over/under voltage Impeller stall Impeller speed below minimum speed Internal error |
| P2602 | Coolant Pump "A" Control Circuit Low | This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating a short to ground to the cabin heater coolant pump. |
| P2603 | Coolant Pump "A" Control Circuit High | This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating an open circuit to the cabin heater coolant pump. |
Possible Causes
- Wiring, terminals or connectors
- Low coolant or air in the coolant system
- Cabin heater coolant pump
- PCM