Avoid Brand X Parts Twists and Turns - Transmission Digest

Avoid Brand X Parts Twists and Turns

Certain aftermarket serpentine belts can create an electrostatic discharge that can impact electrical components that happen to be too close, such as the TCM. In this particular model truck, the TCM is not too far away from the belt, and that was causing the erratic transmission operation and trouble code.

Avoid Brand X Parts Twists and Turns

The Riley Report

Author: Mike Riley
Subject Matter: P0880 Code
Issue: Erratic Shifting

(Unrelated items could be damaged as a result)

The Riley Report

  • Author: Mike Riley
  • Subject Matter: P0880 Code
  • Issue: Erratic Shifting

(Unrelated items could be damaged as a result)

Complaint/Concern:

By the time the owner of a 2011 Chevy Silverado arrived at the shop he had already visited two other repair facilities, but to no avail. According to the owner the truck had been acting erratically for a few weeks. At times, the transmission would delay upshifting and occasionally would have a hard bump or clunk while coming to a stop.

In addition, the diagnostic trouble light would show up until the key was cycled off and back on. Even the trouble light issue was inconsistent. A scanner was attached but initially no codes were recorded.

The truck was taken for a road test and after a short time started to act up just as the owner described. When the trouble light came on a P0880 code was retrieved. At times, the transmission operated quite well.

Cause/Condition:

After further review of the transmission functions, focus was redirected elsewhere. The technician started to rule out items such as loose or corroded wiring as well as any computer issues. During this time the manager happened to ask the owner of the truck if anything had been done recently. As it turned out, the owner, a somewhat-backyard mechanic, had done some maintenance work on the truck. One item stood out as a possible problem, which was the serpentine belt.

Certain aftermarket serpentine belts can create an electrostatic discharge that can impact electrical components that happen to be too close, such as the TCM. In this particular model truck, the TCM is not too far away from the belt, and that was causing the erratic transmission operation and trouble code.

Correction/Modification:

Once it was determined that the serpentine belt was the culprit a new OEM belt was installed, all 11 feet of it, (Figure 1). This issue can occur not only by routine maintenance replacement, but also if certain modifications are made, such as adding an additional alternator.

Unfortunately, even after the belt was replaced the trouble code kept popping up due to the damage inflicted on the TCM, (Figure 2). The shop had no choice but to replace the TCM with a new one. Not only was the TCM replaced, it was relocated to the top of the UBEC cover as well in order to be far away from the belt.

It goes to show: always query customers to find out if any work has been done to a vehicle in for repair.

You May Also Like

Trying to Stop the Wheel Hop on Ford Edge with 6F50 Transmission

The 2014 Ford Edge SEL with a 3.5L engine (figure 1) and a 6F50 transmission can also be equipped with an AWD system. This would include a Power Transfer Unit (PTU) attached to the transmission with a rear driveshaft going to the Read Differential Unit (RDU). The RDU comprises a differential assembly along with a

The 2014 Ford Edge SEL with a 3.5L engine (figure 1) and a 6F50 transmission can also be equipped with an AWD system. This would include a Power Transfer Unit (PTU) attached to the transmission with a rear driveshaft going to the Read Differential Unit (RDU). The RDU comprises a differential assembly along with a viscous coupling assembly controlled by an Active Torque Control (ATC) coupling solenoid. The system is designed to monitor vehicle conditions continuously and seamlessly adjust torque distribution between the front and rear wheels. When it is functioning correctly, there should be no perception of this taking place when launching or driving the vehicle. 

Sherlock Holmes Approach to an AB60 No-Move Situation

The effectiveness in diagnosing automatic transmission malfunctions is an art form. Although there are similarities among the wide varieties of transmissions on the road, each transmission has its own peculiarities. Aside from having mechanical, hydraulic, and electrical hardware systems to contend with, software/programming issues and various vehicle platforms make diagnostics much more difficult.  Related Articles –

ab60
GM 6T40 Pump Identification Guide

The 6T40 was introduced in 2008 for General Motors front-wheel-drive cars in the Chevrolet Malibu and has gone through several changes throughout its three generations, specifically in the pump area. The 6T40 is closely related to the more lightweight 6T30 and the heavier duty 6T45 and 6T50. Generation one started phasing out during the 2012

Seeing the Forest AND the Trees

They say that the proverbial phrase “I couldn’t see the forest for the trees” means that a person or organization cannot see the big picture because it focuses too much on the details. Related Articles – TASC Force Tips: Hydraulics Fundamentals: Check Valves – Shift Pointers: Mazda Sensitive to Pressure – Transmission Testing & Repairs:

The Manifold Pipeway

The Honda six-speed transmission has been on the bench of many specialty shops for one reason or another (figure 1). But, for those of you who have yet to lay your hands on one, mounted on the upper side of the unit is one of the largest, if not the largest solenoid and pressure switch

Other Posts

TASC Force Tips: How to Avoid a Dipstick Move in 4L60-E Series Transmissions

This is certainly an issue that you should look into to ensure that your transmission has adequate fluid capacity to live a long health life.

Critical Wear Areas & Vacuum Test Locations for FORD 6R80/6R100

Note: OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations are noted with an arrow. Springs are not shown for visual clarity. Low vacuum reading indicates wear. For specific vacuum test information, visit www.sonnax.com. Related Articles – Hydraulics Fundamentals: Shift & Relay Valves – Another

Hydraulics Fundamentals: Shift & Relay Valves

Shift valves and relay valves share a lot of the same duties. This article is one of a series by Sonnax exploring how valves and hydraulic circuits work and what results when they quit functioning correctly.

Another 62TE ‘No-Move’ Possibility

Most seasoned techs have several quick diagnostic steps they take when faced with a transmission malfunction. The type of problem and transmission determines which steps to take. For example, a “no-move” condition. Related Articles – 6R80 whirring noise: TCC slip or engine surge? – The torque converter can of worms: Lockup and aftermarket programming –