Last updated on August 25th, 2026 at 03:38 pm
Drivers who encounter a flashing or steady check‑engine lamp often wonder why the vehicle feels “off” for only a few seconds at a time. The P2023 diagnostic trouble code signals that the ECM is receiving intermittent signals from the Intake Manifold Runner Position Sensor (or its switch) on Bank 2. Because the ECM relies on precise runner‑position data to calculate airflow, any gap in that data can momentarily alter fuel‑air mixture and throttle timing. Early identification prevents the fault from evolving into a persistent power‑loss condition.
DTC P2023 · engine computer (ECM/PCM)
OEM programmed replacements — plug & play, no dealer visit.
Find yours by year, make & model →
Free shipping · Lifetime warranty
These signs typically appear sporadically; they may disappear after a few seconds and reappear under different load conditions.
Corrosion, loose pins, or damaged harnesses can create an open‑circuit condition that the ECM interprets as “no signal.” When the connection re‑establishes, the fault clears, producing the intermittent pattern characteristic of P2023.
The ECM’s internal driver that reads the runner‑position sensor can develop micro‑cracks or suffer from moisture intrusion. A compromised input circuit will sporadically reject the sensor voltage, even if the sensor itself is functional.
Factory ECU maps include thresholds for acceptable sensor voltage ranges. An outdated or corrupted calibration can cause the ECM to misclassify normal sensor fluctuations as faults, resulting in intermittent code activation.
If the intake manifold’s runner plates stick or move irregularly, the sensor output may fluctuate. While the mechanical condition is a possible contributor, the ECM’s inability to interpret the varying signal often underlies the P2023 trigger.
Cost considerations
If the fault persists after wiring and software remediation, the ECM input circuit is the most likely culprit.
Repeated intermittent failures after thorough wiring inspection and software updates often indicate internal degradation of the ECM’s sensor‑input circuitry. While temporary repairs—such as board‑level component soldering—can restore function, they rarely guarantee long‑term reliability, especially in environments prone to moisture or vibration.
Modern control modules are deeply integrated with security, immobilizer, and emission‑control networks. Replacing the ECM therefore requires a unit that is correctly programmed to the vehicle’s VIN and calibrated to the exact software version.
Flagship One specializes in VIN‑matched control modules, providing a plug‑and‑drive solution backed by a comprehensive warranty. Their inventory includes fully tested ECMs that arrive pre‑programmed to the specific vehicle, eliminating the need for on‑site coding. This approach minimizes installation time, reduces the risk of programming errors, and ensures that the replacement module communicates flawlessly with all vehicle systems.
When the diagnostic process isolates the ECM as the source of the intermittent runner‑position signal, opting for a Flagship One‑sourced replacement often yields a more dependable and cost‑effective outcome than repeated board‑level repairs.
Adhering to these practices helps maintain a stable communication link between the runner‑position sensor and the ECM, reducing the likelihood of P2023 activation.
Service Recommendation: Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.