P0985 Fault Code

Shift Solenoid E Control Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0985 fault code relates to the 'Shift Solenoid E Control Circuit Low'. This code indicates that the Engine Control Module (ECM) has detected a problem within the circuit that controls the Shift Solenoid E. When this solenoid is not functioning correctly, it can result in improper transmission shifting, potentially leading to reduced vehicle performance.

• The Shift Solenoid E is responsible for managing the flow of transmission fluid.
• A fault in the circuit can cause the solenoid to either fail to activate or deliver inadequate pressure.
• This can result in various issues with gear changes, often leaving the vehicle stuck in a gear or experiencing harsh shifts.

What are the symptoms of the P0985 code?

When a P0985 fault code is present, drivers may experience the following symptoms:

• Harsh or delayed shifting, where the transmission does not change gears smoothly.
• Inability to shift into certain gears, potentially resulting in a 'limp mode' condition.
• Unusual noises while the vehicle is shifting, including grinding or clunking sounds.
• The Check Engine Light (CEL) is illuminated on the dashboard, indicating a problem with the vehicle's powertrain.
• Poor fuel economy due to incorrect shift patterns.

What causes the P0985 code?

Several factors can contribute to the occurrence of a P0985 fault code.

• Electrical issues, such as short circuits or open circuits in the wiring harness, can disrupt the solenoid's operation.
• Corroded terminals or loose connections may prevent proper communication between the solenoid and the ECM.
• A malfunctioning shift solenoid itself may also be the root cause.
• In some cases, low transmission fluid levels or the presence of contaminated fluid can impact the solenoid's performance.
• ECM software issues may also be a contributing factor and could require reprogramming for resolution.

How to fix P0985?

To resolve a P0985 fault, the following steps should be taken:

• Conduct a thorough inspection of the wiring and connectors that lead to the Shift Solenoid E to identify any damage, corrosion, or disconnections.
• Ensure the transmission fluid is at the appropriate level and in good condition; replace it if it is dirty or low.
• Test the Shift Solenoid E with a multimeter to check for faults; replace the solenoid if it is non-functional.
• If electrical issues are found, repair or replace the wiring as needed.
• If no physical issues are found, consider updating or reprogramming the ECM to ensure optimal function.
• After repairs are completed, clear the fault codes and conduct a test drive to confirm that the issue has been resolved.