P07B8 Diagnostic Trouble Code

P07B8 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 P07B8 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P07B8 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 P07B8.

Fortunately, P07B8 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P07B8 Trouble Code For Specific Cars

P07B8 Pininfarina Metrocubo ETC In Power Limiting Mode
P07B8 Reliant Rebel Gate Select Actuator Circuit Low
P07B8 Bristol Beaufighter Crankshaft Position Sensor A Circuit Low Input
P07B8 Porsche 931 Fuel Filler Door Circuit Open
P07B8 Tesla S Mismatched PCM and/or ABS-TC Module
P07B8 Sbarro Sv Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
P07B8 Renault Clio 5 Gear Shift Position Circuit [senses forward / rearward position, odd / even gears]