P0542
Powertrain Codes
P0542 - CHRYSLER - Intake Air Heater Relay 1 High
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- Open or short intake air heater relay circuit condition - Intake air heater relay poor electrical connection - Faulty Intake Air Heater Relay
When Detected
The P0542 code is detected when the Signal from the #1 intake air heater output does not match the signal input
Description
The engine control module (ECM) uses an intake air heater (IAH) to warm the incoming air for proper cylinder combustion. The ECM grounds the control coil of the IAH relay to energize the heater during cold operation. The ECM sends a bias voltage on diagnostic circuits one and two.