Diagnostic article Generic OBD-II
P245A: The cooler-bypass open check requires an off driver but a non-closed request
Understand the distinct command and requested-position conditions in GM P245A and why they should not be collapsed into a generic valve test.
Read before applying this article
Documented application
2025 GM 04A documented monitor only. Vehicle, engine and controller calibration applicability must be established separately; no model fitment is inferred from the file.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P245A identifies an open control circuit for the bank 1 EGR cooler bypass. In the cited GM implementation, the hardware interface assesses load resistance on the high-pressure EGR cooler-bypass motor circuit. This is an electrical integrity result rather than direct evidence that the cooler is obstructed.
Driver state and requested position are different conditions
The source requires the H-bridge driver to be off while the valve is requested somewhere other than its fully closed default position. Those statements refer to different aspects of control and should not be collapsed into an instruction that the valve must simply be on or off.
The open classification uses load resistance above 200 kΩ, reported by the hardware interface. The system must be outside cranking, relay supply above 11 V and diagnostics enabled. The hardware error status must be determinate, so an unavailable result is not a confirmed open circuit.
Interpret the repeated electrical finding
The monitor counts 160 failures within 200 samples on a 12.5-millisecond task and uses two-trip reporting. Preserve the requested position, bridge state and hardware status alongside that history. A different commanded state may not reproduce the same assessment.
The summary does not locate an interruption inside the motor, harness or controller, and it supplies no connector-level resistance procedure. It also does not justify a cooler replacement from an electrical open-circuit code. Use the matching actuator and circuit information to identify the fault before choosing a repair.
Source and applicability
2025 GM 04A documented monitor only. Vehicle, engine and controller calibration applicability must be established separately; no model fitment is inferred from the file. GM PDF, physical page 1190.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
EGR Cooler Bypass Control Circuit/Open Bank 1
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT