P0986Generic code

P0986 Code: Shift Solenoid E Control Circuit High

The P0986 code means the transmission computer sees high voltage in the control circuit of shift solenoid E, which points to an open circuit or a short to voltage. Check the transmission connector and wiring before you replace the solenoid. Driving it is possible with caution, but the transmission can drop into limp mode.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$80 to $900
Difficulty
Medium
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0986 code means

Solenoids are electric valves that direct hydraulic pressure to the clutches and brakes inside an automatic transmission. Shift solenoid E opens or closes the fluid path to one specific clutch, and the combination of solenoids that are on or off decides which gear you are in. The transmission computer commands them and watches both their electrical circuit and the result, which it judges from the input and output shaft speeds.

The P0986 code is set when the computer sees high voltage in the control circuit of the solenoid, meaning an open circuit or a short to voltage. This is an electrical fault. The suspects are the wiring, the connector (very often the case pass-through connector, which can leak fluid), the solenoid itself, or the control module.

On any transmission code, check the fluid first. The level has to be right using the manufacturer procedure, which often calls for the engine running at a specific temperature. The fluid should be red or pink and should not smell burnt. Low or worn fluid causes slipping, harsh shifts and solenoid or gear ratio codes that go away once the fluid is corrected.

To confirm the diagnosis, measure the continuity of each wire between the component connector and the computer connector with the key off. It should be under 1 ohm, and an infinite reading means the wire is open. If the wiring checks out, measure the component itself: infinite resistance confirms that it is open inside.

Read the P0700 guide to understand how transmission codes are retrieved and why you need a scan tool that can talk to the transmission module, not just the engine computer.

P0986 code symptoms

  • Check engine light or transmission warning light on.
  • Harsh shifts, late shifts or shifts that never happen.
  • Limp mode: the transmission stays in one fixed gear, often 2nd, 3rd or 4th.
  • Slipping or high rpm in certain gears.

Likely causes of the P0986 code

  1. Transmission connector with fluid inside or corrosion. Very common at the case pass-through connector.
  2. Damaged internal or external wiring, from heat or from rubbing.
  3. Solenoid with an open or shorted coil. The resistance is out of specification.
  4. Transmission control module. Uncommon, so rule out everything else first.

How to diagnose the P0986 code step by step

  1. Check the fluid level and condition using the manufacturer procedure.
  2. Read all the codes in the transmission module with a scan tool that can access it.
  3. Measure the solenoid resistance at the transmission connector and compare it with the service manual.
  4. Check the insulation to ground. It should read infinite.
  5. Command the solenoid with the scan tool and listen for the click.
  6. Inspect the case connector. Look for fluid inside it or green, corroded pins.

How to fix the P0986 code

  • Repair the connector or the wiring.
  • Replace the solenoid, or the whole valve body if the solenoid is built into it.
  • Clear the adaptations and run the relearn procedure.
  • Clear the codes and confirm the repair with a road test.

Technical reference data

  • Shift solenoids (on/off type): roughly 10 to 30 ohms.
  • Pressure or linear solenoids (PWM control): roughly 3 to 8 ohms.
  • Normal transmission fluid temperature: 70 to 95 °C (158 to 203 °F).
  • These values are only a guide, so look up the manufacturer data for your vehicle.

Brand-specific notes

After you replace solenoids or a valve body, it is usually necessary to clear the adaptations and run a relearn with a scan tool, whatever the brand.

P0986 on Aisin and Jatco

On many of these transmissions the solenoids sit in the valve body, and you reach them by removing the pan.

P0986 on GM and Ford

The same layout applies to the GM 6T and Ford 6R transmissions, where the solenoids are in the valve body behind the pan.

P0986 on Volkswagen

On the Volkswagen DSG, and on many modern transmissions, the solenoids are sold only together with the valve body or with the integrated control module, which is the mechatronic unit.

Frequently asked questions about P0986

Can I drive with a P0986 code?
With caution, and only as far as the shop. The transmission can fall into limp mode, and driving that way for a long time wears it out.
Will an oil change fix it?
Sometimes, mainly with performance or stuck codes. With an electrical fault like this one, it will not.
Does the transmission have to come out?
Normally not. The solenoids are replaced by removing the pan or the valve body cover.
How much does it cost to fix P0986?
Roughly $80 to $900, and more if the transmission itself needs repair.
What does the P0986 code mean?
It is a generic OBD2 code that means the control circuit of shift solenoid E has high voltage, from an open circuit or a short to voltage. It is an electrical problem in the wiring, connector, solenoid or control module.
Will a P0986 code clear itself?
Only if the cause was a passing glitch. A real open wire, a bad connector or a failed solenoid will bring the P0986 code back and the light will return.
What is the most common cause of P0986?
The case pass-through connector, with fluid inside it or corroded pins, and wiring damaged by heat or rubbing. Check those before you replace the solenoid.

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