P1158 Diagnostic Trouble Code

P1158 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P1158 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P1158 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P1158.

Fortunately, P1158 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1158 Trouble Code For Specific Cars

P1158 Lotus Xi Traction Control Output Circuit Malfunction
P1158 Porsche Mega Fuel Pump Secondary Circuit Malfunction
P1158 Bristol 410 Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor B)
P1158 Glas 1500 Overdrive switch circuit short to Vbatt
P1158 Ac Greyhound ABS Functions Temporarily Disabled
P1158 Trabant Universal Passenger Sid, Side mount Airbag Low resistance on Squib
P1158 Mazda Roadster 4x4 Low Switch Error