1999 Cadillac Escalade DTC P1810


Transmission problem
1999 Cadillac Escalade V8 Four Wheel Drive Automatic 123, 00 miles

I purchased the Escalade at about 67k and changed the transmission fluid and filter 2-3 times. The fluid is clean, filled to the appropriate level and the vehicle seems to shift normally. However, a service engine soon light prompted me to scan the vehicle and my OBDII scanner indicated a DTC P1810 Transmission Fluid Pressure Manual Valve Position Switch Assembly Malfunction. What would you recommend to repair/correct this problem if we are planning to keep this vehicle for some time? Will a more sophisticated computer diagnostic further isolate the cause of the DTC? Would a replacement of the switch likely correct the problem? I read the procedure to change this part and it appears within my capabilities. I just don't want to change this project into a money pit if this will not correct the problem. Will issues with the valve body or TFP switch assembly contribute to further damage to the transmission? In other words, what risk does the DTC pose to the transmission/torque converter if I continue to drive the car?

Thank you for your help.

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have the same problem?
Saturday, April 10th, 2010 AT 5:55 AM

1 Reply


There is a service bulletin that relates to your concern. It specifies replacement of the switch. The switches are faced up, and often times debris in the fluid will settle on the switch itself. This can result in invalid signals, and they can be intermittent. Here is the bulletin;
#99-07-30-013: Tech - Service Engine Soon (SES) Light Illuminates (Repl Switch Assy) - (Jul 27, 1999)

Subject: Service Engine Soon (SES) Light Illuminates, DTC P1810 Set (Replace TFP Switch Assembly)

Models: 1999 Cadillac Escalade

1998-99 Chevrolet Camaro, Corvette

1998-99 Pontiac Firebird

1998-99 Chevrolet and GMC C/K, M/L, S/T, G Models

1998-99 Oldsmobile Bravada

1998-99 Holden Commodore

with Hydra-Matic 4L60-E Transmission (RPO M30)

Some customers may comment about the Service Engine Soon light illuminating. The PCM will have stored a Diagnostic Trouble Code P1810, Transmission Fluid Pressure Manual Valve Position (TFP) Switch assembly circuit malfunction.

Debris from aluminum shavings, bronze material, and certain clutch material may cause the pressure switches in the TFP switch assembly to stick or electrically short out.

A new TFP switch assembly with a plastic shield has been released. The plastic shield is designed to protect the pressure switch from debris. This improvement will reduce the likelihood of a DTC P1810. This product change went into production on April 8, 1999 (Julian date 098). The existing TFP switch assembly remains relatively unchanged except for the addition of the new shield, creating a new part number for the assembly. The shield fits over the existing TFP switch assembly and is not sold separately.


Follow diagnostics for the P1810 Diagnostic Trouble Code in the Transmission Section of the appropriate Service Manual. If the diagnostics indicate that switch replacement is necessary, use the correct switch P/N as listed below.

Service Parts Information
Part Number

TFP Switch Assembly with Shield

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Saturday, April 10th, 2010 AT 9:47 AM

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