AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Saturn - P1818 Saturn

P1818 Saturn Code - Transmission Fluid Pressure Valve Position Switch-Drive Without Drive Ratio

- Code Popularity: 4,931 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P1818 Saturn?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch
  • TFP Valve Position Switch harness is open or shorted
  • TFP Valve Position Switch circuit poor electrical connection
⚠ Does your Saturn have Safety Recalls? → Check here

How to Fix the DTC P1818 Saturn?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P1818 Saturn Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1818 Saturn code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1818 Saturn Description

The automatic Transmission Fluid Pressure (TFP) manual valve position switch consists of five pressure switches (two normally-closed and three normally-open) and a Transmission Fluid Temperature (TFT) sensor combined into one unit. The combined unit mounts on the valve body.
The Powertrain Control Module (PCM) supplies ignition voltage for each range signal. By grounding one or more of the circuits through various combinations of the pressure switches, the PCM detects which manual valve position you select. The PCM compares the actual voltage combination of the switches to a TFP manual valve position switch combination table stored in memory.
The TFP manual valve position switch cannot distinguish between PARK and NEUTRAL because the monitored valve body pressures are identical. With the engine OFF and the ignition switch in the RUN position, the TFP manual valve position switch indicates PARK or NEUTRAL. Disconnecting the AT inline 20-way connector removes the ground potential for the three range signals to the PCM. In this case, with the engine OFF, and the ignition switch in the RUN position, D2 will be indicated.

OBDII Code P1818 Saturn - Transmission Fluid Pressure Valve Position Switch-Drive Without Drive Ratio - AutoCodes.com
P1818 Saturn Code - Transmission Fluid Pressure Valve Position Switch-Drive Without Drive Ratio

Need More Information on the Code?

Need more information on how to fix the P1818 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1818 Saturn code diagnosed by a professional: Find a repair shop in your area

Code P1818 Saturn comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1818 Saturn code? Have you replaced any parts?
Any information is appreciated. Thanks