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DTC - Diagnostic Trouble Codes information

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.