C3994 Ford F-150 OBD Code

OBD/2 C3994 error code description and symptoms.

The issue covered by the bulletin involves a power steering noise/whine or fluid leak from the power steering pump, gear or high pressure side power steering hose during extreme low outdoor temperature operation.

On some transmissions, such as automated manual transmissions or automatic transmissions with manual mode, the GSP switch lets the TCM know whether or not the driver has selected automatic or manual function. On manual transmissions, the GSP switch informs the TCM which gear the driver is selecting, and may function as a neutral safety switch, depending on system design. The TCM also uses the gate select position switch to monitor transmission operation. For example, if the driver selects manual mode and selects 3rd gear on an automatic transmission, the TCM may monitor speed sensors to detect clutch and brake slippage.

C3994 Ford F-150 Error Code Repair Process :

The rule of C3994 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of air suspension rear inflator solenoid output circuit open. Likewise, overriding the OBD C3994 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Ford F-150 C3994 OBD2 Code

A common cause of code C3994 is the failure of Air Suspension Rear Inflator Solenoid Output Circuit Open, but there are several other possible causes as well, such as ;

Exhaust gas leaks
Faulty Variable Camshaft Timing (VCT) position solenoid
Faulty TCM or TCM programming
Oil flow restriction in the oil passages or the VCT valve body

C3994 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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C3994 Ford F-150 OBD Code

C3994 Ford F-150 Error Code Repair Process :

Common Causes of Ford F-150 C3994 OBD2 Code

C3994 code for other Ford cars