P158b Renault

The Engine Control Module (ECM) has detected that the idle speed controller (often a throttle body or dedicated idle air valve) is not operating within the expected manufacturer specifications. The ECM is trying to adjust the idle speed, but the component is not responding correctly. Common Symptoms of P158B on Renault Vehicles

The ECU will restrict performance to protect the engine, limiting acceleration. p158b renault

Inside the lead clamp, hidden from view until now, was a thin, nearly invisible layer of oxidation—a white, powdery residue that acted like a resistor. It was enough to choke the high-current demand the turbo-diesel engine needed during startup, causing the ECU to panic and throw the ghost code P158B. The Engine Control Module (ECM) has detected that