AutoCodes – Generic – P2799

P2799 Code - Auxiliary Transmission Fluid Pump Control Circuit High

Quick Answer

The Hybrid Vehicle Control ECU monitors the operation of the Auxiliary Transmission Fluid Pump. Common causes include Faulty Oil Pump Motor Controller, Oil Pump Motor Controller harness is open or shorted, Oil Pump Motor Controller circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2799 indicates Auxiliary Transmission Fluid Pump Control Circuit High.
Common causes: Common causes include Faulty Oil Pump Motor Controller, Oil Pump Motor Controller harness is open or shorted, Oil Pump Motor Controller circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 12,969

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2799 Description

The Hybrid Vehicle Control ECU monitors the operation of the Auxiliary Transmission Fluid Pump. If the Hybrid Vehicle Control ECU detects a malfunction of the Auxiliary Transmission Fluid Pump control circuit, the Hybrid Vehicle Control ECU will illuminate the MIL and set a Diagnostic Trouble Code (DTC).

OBDII Code P2799 - Auxiliary Transmission Fluid Pump Control Circuit High - AutoCodes.com — P2799 Code - Auxiliary Transmission Fluid Pump Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P2799?

Faulty Oil Pump Motor Controller
Oil Pump Motor Controller harness is open or shorted
Oil Pump Motor Controller circuit poor electrical connection
Faulty Hybrid Vehicle Control ECU
Faulty Oil Pump Motor Relay

How to Fix the DTC P2799?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2799 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2799 code?

Need more information on how to fix the P2799 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P2799 Lexus — Auxiliary Transmission Fluid Pump Control Circuit High
P2799 Toyota — Auxiliary Transmission Fluid Pump Control Circuit High

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.