P0918 Gear Shift Position Circuit – Intermittent Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0918 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0918 code

P0918 is a diagnostic trouble code (DTC) for "Gear Shift Position Circuit – Intermittent Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0918 DIAGNOSTIC Get a fair and transparent estimate upfront

P0918 code definition

In vehicles equipped with automatic transmissions, a P0918 code means that the powertrain control module (PCM) has registered an intermittent fault in the transmission shift mechanism range circuit, particularly in regard to a specific lever position. The PCM uses data from the transmission range sensor, in order to control engine RPMs, fuel metering, ignition timing and other drivability factors.

What the P0918 code means

For most vehicles, a universal resistance level of 8 ohms is the norm in this particular circuit. Any fluctuation of greater than 10 percent (higher or lower) will result in a P2A00 code and an illuminated malfunction indicator lamp (MIL). Heater circuit voltage should be consistent with battery voltage, and any 10 percent fluctuation can result in a stored trouble code as well. Closed-loop O2 sensor readings that remain constant for 8 seconds or more can also result in a stored code and illuminated MIL.

What causes the P0918 code?

In most cases, a P0918 code is due to a failed transmission range sensor or an out-of-adjustment transmission range sensor. The code is specifically for an intermittent problem, so in many cases a P0918 code is due to failed, loose, damaged or corroded wiring or contacts.

What are the symptoms of the P0918code?

  • Harsh shifts
  • Failure to shift
  • Limp-in mode
  • Poor fuel economy

How does a mechanic diagnose the P0918 code?

A technician will need a good quality OBD-II scanner/code reader and a digital volt/ohmmeter (DVOM).

Most vehicles, especially Ford models, are designed with a variable resistance transmission range sensor. This switch is located over the shaft for the transmission sensor, where the lever slides along a row of contacts. When the shift lever is moved, this range sensor pivots and is moved to different contacts.

The contacts send varying levels of resistance to the PCM, according to the position of the shift lever. The PCM reads these differing levels of resistance and voltage as the gear selected at the shifter, and acts on this information to determine shift points, engine ignition timing, fuel metering and other functions. The PCM also determines the proper gear for the transmission according to information on engine load, RPMs other factors.

  • Go over all related wiring, connectors and components and repair/replace any open, shorted, corroded or damaged wiring found. Retest the system. If all wiring, connectors and components check, connect the scanner to the diagnostic port and record any stored trouble codes.
  • Check the transmission range sensor for battery voltage/ground signals.
  • If either ground or battery voltage circuits check as “open,”, check for continuity/resistance in both circuits using the DVOM. Remember to disconnect any related control modules to avoid damage.
  • Using a factory schematic, test any related circuits and the sensor itself for resistance/continuity. Compare to factory specs and replace/repair any circuits, connectors or components that do not comply with specs.
  • Clear codes and retest the system.

Common mistakes when diagnosing the P0918 code

Often, technicians replace the entire transmission range sensor when adjustment would have been sufficient. In some cases, technicians have even been known to condemn the transmission unnecessarily.

How serious is the P0918 code?

A P0918 code can prevent a transmission from shifting out of a gear, and can put the vehicle in limp-in mode, meaning it will barely be drivable at all.

What repairs can fix the P0918 code?

Repair or replacement of:

Additional comments for consideration regarding the P0918 code

A P0918 code can accompany recent transmission work. Check the range sensor’s wiring for corrosion or damage and check the sensor for proper adjustment. When installing the sensor, use thread locking compound to ensure the proper torque retention for the mounting bolts.

Need help with a P0918 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

P0918
trouble codes
OBD-II

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0918 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,829

Rating Summary
4,442
187
48
28
124
4,442
187
48
28
124

Walter

44 years of experience
64 reviews
Walter
44 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Tulsa, Oklahoma
Went above and beyond my expectations, as i was very nervous about this type of service! But to my surprise, I am absolutely satisfied with the service ! Would recommend 100X to all i know! Thanks for the care and information and time you put in to my qoute and truck@

Keith

16 years of experience
279 reviews
Keith
16 years of experience
BMW 535i xDrive - Check Engine Light is on - Kissimmee, Florida
Very personable, knowledgeable person, who provided information on my car that I was not aware of. The overall experience was great and I would definitely refer this company to my family and friends.

Luis

13 years of experience
20 reviews
Luis
13 years of experience
Audi A3 - Check Engine Light is on - Van Nuys, California
Luis was awesome. Very knowledgeable and a down to earth person. Would highly recommend and plan on using him in the future for any repair that I need!

Joel

19 years of experience
742 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

More related articles

P0032 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 1 Sensor 1)
P0032 trouble code definition P0032 is the code for HO2S Heater Control Circuit High (Bank 1 Sensor 1) What the P0032 code...
What Gases Does the OBD Detect in the Exhaust?
Your Your engine runs on combustion – fire – which creates exhaust gases. A wide range of gases are produced during normal operation, and they must be controlled because many of them become pollutants when released into the atmosphere. It’s...
P0454 OBD-II Trouble Code: Evaporative Emission Control System Pressure Sensor Intermittent
P0454 means there is an issue with the evaporative emission control system due to faulty fuel cap, solenoid, or broken hoses, canister, or vacuum.

Related questions

Hard throttle bucking

If the split seal on the air intake is after the MAF (Mass Airflow Sensor), it will cause this problem. When you give the motor a lot of throttle, a much larger amount begins to flow into the motor. This...

What is P0335 Crankshaft Position Sensor A Circuit and where is it located?

Hello - this message (P0335) indicates that the crankshaft position sensor is failing, causing the "cutting off" you have already noticed. It is located on the bottom of the engine/transmission interface (drivers side of the vehicle). To avoid any unnecessary...

Do all cars have an OBD system?

Virtually all vehicles from the 1987 model year to the present day have an OBD system. Some earlier model year vehicles, but not all, have some semblance of an OBD system. However, their diagnostic abilities are severely limited. There are...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com