Fix P083B: Mechanic’s solutions that WORKED

The code P083B: Transmission Fluid Pressure Sensor/Switch “G” Circuit Range Performance indicates a fault in the transmission fluid pressure sensor or switch circuit, and it is most often caused by electrical issues or internal mechanical problems in the transmission.

P083B quick overview

Meaning	P083B: Transmission Fluid Pressure Sensor/Switch “G” Circuit Range Performance
Is it serious?	Yes, it can be serious as it affects the transmission’s operation, potentially leading to altered shift patterns or putting the vehicle into a limp mode.
Possible causes	– Open in the signal circuit to the TFPS sensor – Short to voltage in the signal circuit – Short to ground in the signal circuit – Failed TFPS Sensor – Internal mechanical transmission issue – Failed PCM or TCM
How to diagnose?	Check for TSBs: Search for any Technical Service Bulletins related to this code. Inspect TFPS Sensor: Locate and visually inspect the TFPS for damage or corrosion. Clear and Recheck Codes: After inspection or repair, clear the codes and see if P083B returns. Test Sensor and Circuits: Use a DVOM to test the TFPS sensor’s voltage and resistance. Consider PCM/TCM Issues: If other diagnostics are inconclusive, evaluate the PCM or TCM.

In simple language, the P083B code means there’s a problem with the sensor or switch that measures the pressure of the transmission fluid. This issue can mess up how your car shifts gears, and it’s usually caused by a wiring problem or something wrong inside the transmission itself. To figure out what’s going on, you’ll need to check out this sensor, make sure all the wires are okay, and sometimes look into the car’s computer systems.

How to fix P083B – learn from mechanics

I looked into P083B service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. Unfortunately, the P083B is a rare code and I could find only one service case.

Case #1: Chrysler

Vehicle Information

• 2011 Chrysler Town & Country Touring L 3.6L

Issue + Repair History

• Inoperative front turn signals and rear brake lights.
• Replaced brake stop switch; brake lights now function.
• Front turn signals and hazard functions still not working.
• Codes: P0693, P0325, B1640, B163C, P083B.
• Found missing pins in knock sensor harness; replaced with new dealer harness.
• Previous repair: Replaced amber turn light signal bulbs.

Other OBD2 Codes + Test Results

• P0693, P0325, B1640, B163C, P083B

Suggestions to Fix Issue

• Inspect grounds.
• Check for Technical Service Bulletins (TSBs) related to TIPM.
• Scan the Body Control Module (BCM).
• TIPM replacement with wire relocation as per Chrysler Instruction Sheet K6855837 or S1608000099.
• Voltage Drop Testing.

Final Fix

• Replacement of the TIPM (Totally Integrated Power Module).

Advice	Diagnostic Step Description
Inspect Grounds	Check all grounding points for corrosion, loose connections, or damage. Ground issues can lead to various electrical problems in the vehicle.
Check for Technical Service Bulletins (TSBs)	Look for any manufacturer-issued TSBs related to the specific fault code. TSBs can provide valuable information about known issues and their solutions.
Perform Voltage Drop Testing	Conduct voltage drop tests to identify any issues with the vehicle’s electrical system that might be causing the fault.
Check Transmission Fluid Pressure Sensor/Switch	Locate and inspect the TFPS for damage, corrosion, or loose connections. This sensor is critical for the transmission’s operation and can cause the P083B code if faulty.
Clear Codes and Recheck	After making repairs or adjustments, clear the diagnostic trouble codes and see if the P083B code returns. This can help confirm whether the issue has been resolved.
Test TFPS Sensor and Circuits	Check the TFPS sensor and its circuits for proper voltage and resistance. This involves using a Digital Voltmeter and ohmmeter to ensure the sensor and its connections are functioning correctly.
Consider PCM/TCM Issues	Although less likely, a failed PCM (Powertrain Control Module) or TCM (Transmission Control Module) could cause the P083B code. Consider this possibility if all other diagnostics and repairs fail to resolve the issue. Note that PCM/TCMs must be programmed.