P0659 Code - Actuator Supply Voltage 'A' Circuit High

What Does P0659 Mean?

This code indicates that a fault has been detected in the actuator supply voltage “A” circuit. The PCM or one of the other supporting control modules has detected this fault. These control modules may include (but are not limited to) the alternative fuel control module, the body control module, the antilock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module. The letter “A” isolates a particular area of the circuit more than a particular component or wire.

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What are the common causes of P0659 ?

• 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.
• Fuel with a large percentage of sulfur will clog the DPF quickly

How do you troubleshoot P0659 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0659 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

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