The transmission business can be exhausting, not only physically but also emotionally and financially. ATRA is here to help provide answers and find creative fixes for the problems you encounter during the day-to-day grind.
One problem we hear quite frequently on the Hotline involves Chrysler/Dodge vehicles with DTC P0882. This often shows up on trucks with the 45/545/65/66/68RFE, 42RLE, and 41/62TE units. So there are a lot of Chrysler and Dodge vehicles that may set code P0882.
Understanding Code P0882
So what is code P0882? It indicates low power input.
The system tests for code P0882 when you turn the ignition from Off to Run, or from Start to Run.
The code sets when the computer detects less than 3.0 volts at the transmission control relay output circuits at the powertrain control module (PCM) when the PCM is energizing the relay.
Typically, this code indicates an issue with the transmission control relay, a faulty wire from the relay to the PCM, chafed wires, connector problems, or a failure in either the powertrain control module (PCM) or the totally integrated power module (TIPM).
Diagnosing Code P0882
Let’s look at the basic checks to determine the cause of this code (figure 1). We’ll be using wiring and computer information for a 2007 Dodge Dakota 4.7L with the 545RFE automatic transmission. While these checks are going to be virtually identical across the different models and engine sizes, always refer to the appropriate wiring schematic for the vehicle you’re working on.
To begin checking:
Step 1 — Clear the code and take vehicle for a road test to see if code returns. If code returns, proceed to step 2. If code doesn’t return during the road test, proceed to step 5.
Step 2 — With the vehicle in park and the key off, disconnect the C4 connector from the PCM (figure 2).
Step 3 — Connect a jumper lead with a 10-amp fuse from the battery positive cable to terminal 18 (Yellow/ Dk Blue wire) in the C4 connector (figure 3). Applying system voltage to terminal 18 should close and energize the transmission control relay.
Step 4 — Check for voltage at terminals 19, 28, 38 (Yellow/Orange wire) of the PCM C4 (Black/Green) connector and terminal 10 (Yellow/ Orange wire) of the transmission harness connector (figure 4). Each should have system voltage from the battery through the relay inside the TIPM.
When checking the voltage at the PCM and transmission, have a helper wiggle the wiring harness in several locations and make sure there’s no voltage loss at any of the terminals (figure 4, page 12). The measured voltage at each terminal must be exactly system voltage.
If the voltage is correct, proceed to step 5.
If voltage isn’t the same, check these terminals (figure 5):
- Terminal 10 of the C1 connector at the TIPM
- Terminal 9 of the C10 connector at the TIPM
- Terminals 20 and 16 at the C130 junction connector
- Ground wires at terminal 12, 13, and 14 of the C4 connector at the PCM
The ground wires must have less than 0.05 volts. If the ground voltage is greater than 0.05 volts, repair the ground or splice and run a new wire from the PCM to a good chassis ground.
If the voltage checks are all correct and the code still sets, it’s likely caused by a PCM failure.
If the code won’t reset, well, that’s a problem, because all checks will test the way they’re supposed to and you won’t find anything wrong. Replacing the TIPM or the PCM often resolves these intermittent issues. But they can be pricy, so randomly replacing one of these components without knowing which is faulty isn’t a great choice.
But there’s a test you can make that won’t break the bank: You can temporarily bypass the TIPM. By wiring a simple 4-pole relay into the circuit, you can eliminate the TIPM as the cause of the issue, and this will often allow you to pinpoint the problem.
Step 5 — Bypass the TIPM
To perform this test, you’ll need a relay. These are available from many sources, online or from your local auto parts store. I found these on Amazon for about 6 bucks each (figure 6), which is a far cry from the several hundred dollars for a new TIPM.
IMPORTANT: Bypassing the TIPM is a temporary test procedure. So, when cutting wires in the harness, always leave enough wire on both sides to repair the circuits later.
- Run a 10-amp fuse inline from the battery positive terminal to terminal 87 of the relay plug.
- Run a ground wire from a good chassis ground to terminal 85 of the relay.
- Cut the Yellow/Dk Blue wire at terminal 20 of the C130 connector and splice the wire to terminal 86 of the relay. This wire powers the relay when you turn the ignition on. Always cut on the side of the connector that goes to the PCM; not the TIPM. If you’re unsure, perform a continuity test between the C130 connector and the PCM C4 connector terminal 18.
- Cut the Yellow/Orange wire at terminal 16 of the C130 connector and splice the wire to terminal 30 of the relay. Always cut the wire on the side of the connector that goes to the PCM, not the TIPM. If you’re unsure, perform a continuity test between the C130 connector and the PCM C4 connector terminals 19, 28, or 38.
Now that the relay is wired in, tie the cut wires back in the harness. The vehicle should be back in working order without code P0882. You can let the customer drive the vehicle for a few weeks to make sure there’s nothing else wrong with the system.
If the code doesn’t come back, you’ve identified the problem as a faulty TIPM. Remove the test relay, repair the wiring, and replace the TIPM.
Keep in mind that, while you could leave the relay in place permanently instead of replacing the TIPM, doing so could create its own set of problems, particularly if the relay ever fails. In that case, the test procedures in your shop manuals or online will be wrong; the only way to diagnose the system will be if you’re familiar with the modifications you made to the TIPM.
That’s why we recommend replacing the TIPM… so you don’t build in a problem that’ll show up later, possibly at another shop, where they aren’t familiar with this test procedure.
But one thing’s for certain: It works. Give it a try the next time you’re faced with code P0882 on a Chrysler or Dodge transmission: It might become your favorite test procedure.