P1490 Cooling Fan Relay Circuit Overcurrent
The P1490 code indicates that the Powertrain Control Module (PCM) has detected an overcurrent condition in the control circuit of the cooling fan relay. This means the current draw from the relay coil exceeds the calibrated limit, typically due to a short to ground in the control wiring, a faulty relay with an internally shorted coil, or a failed driver transistor inside the PCM.
01. Most Common Causes
02. Symptoms You Will Notice
- Engine overheating
- Cooling fan running continuously or not at all
- Check Engine Light illuminated
- Possible A/C performance issues
03. Step-by-Step Diagnosis
Scan for codes and verify P1490 is present
Inspect cooling fan relay and connector for damage, corrosion, or pushed pins
Test relay coil resistance and compare to specifications
Check for short to ground on the control wire from PCM to relay
If wiring and relay are good, suspect internal PCM failure
1. Frequently Asked Questions
Is it safe to drive?▼
No, driving with P1490 is not recommended as it can lead to engine overheating and potential damage. The cooling fan may not operate correctly.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple relay replacement or a more complex PCM repair.