P245B — EGR cooler bypass control circuit, bank 1 — range/performance fault

P245B concerns EGR cooler bypass control circuit, bank 1. The monitored response falls outside the expected range or performance relationship. The monitored function is the cooler bypass control. The definition does not specify that the bypass is stuck in a particular position.

Affected system: Exhaust-gas recirculation and cooling

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Exhaust or emissions plumbing leak, restriction, valve fault, sensor fault, or damaged wiring
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
• Repair the verified cause and confirm the code does not return

Also written as: P245B-00, P245B00 (some scan tools add the fault-type byte, e.g. -00).