What does it mean?
P1499 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Exhaust Gas Recirculation Cooler Switch-over Valve 2 Open circuit/short circuit to ground .
Symptoms
- MIL on
- Longer warm up time, or the engine running cooler than it should
- Higher emissions, and on diesel engines problems completing particulate filter regeneration
- Rough running while the engine is cold
- Reduced power or a protective limp mode in some cases
- Coolant temperature behaving unusually during warm up
Likely causes
- Open circuit or short to ground in the control wiring of the EGR cooler switch-over valve
- Failed switch-over valve solenoid, open or shorted internally
- Connector near the exhaust side of the engine corroded or heat damaged
- Harness chafed against hot components or a bracket
- Blown fuse or lost supply voltage to the valve
- Valve mechanism clogged with soot, raising current draw and stressing the circuit
- Control module output driver failure
How to fix it
- Command the switch-over valve with a scan tool and watch for a response
- Inspect the connector and harness near the EGR cooler for heat and chafe damage
- Verify supply voltage at the valve and check the circuit fuse
- Measure the solenoid resistance and compare it with specification
- Test the control wire for continuity to the module and for a short to ground
- Clean or replace a soot clogged valve and repair damaged wiring
- Clear the code and verify normal coolant temperature behaviour through a full warm up