You can’t learn everything from a manual: Ram ProMaster City test case

You can’t learn everything from a manual: Ram ProMaster City test case

Today’s adventure starts with a customer coming into the shop with a 2015 Ram ProMaster City van with a 2.4L 4-cylinder engine and a 948TE 9-speed transmission. The customer came to our shop because the battery went dead, and after the new battery was installed, a bunch of warning lights came on. The odometer was flashing, and the transmission was clunking into gear, and his buddy who helped him change the battery had a generic OBD2 code reader that was able to pull a couple of transmission codes. They had no idea what they meant, but they were pulled from the TCM and useful to us. 

As the technician for this repair, my initial thought was that there was no way that changing a battery could cause this issue. Then my second thought was, could they have hooked up the jumper cables backwards, or possibly reversed the cables when the new battery was installed?

I started the engine and put the transmission into Reverse, backed up and tried to shift into Drive, but the shifter was locked into Reverse; it would not budge. I shut it off and moved it into Park. I started it up again, put it in Drive and pulled it into the shop. Once again, the shifter was locked, but in the Drive position this time, and would not move. The customer had never mentioned this as an area of concern. 

I then hooked up the Snap-On Zeus scan tool and ran a Vehicle System Report, which scans all of the modules equipped on the vehicle. It found the following codes in the TCM: P2784 (Input Speed Sensor 1/2 Correlation), P0610 ECU (Vehicle Options Mismatch), P1720 (Output Speed Sensor/Wheel Speed Rationality) and P1500 (ECU Configuration Mismatch). The ABS, BCM and ESM controllers were all showing configuration and low voltage codes.


As with all evaluations, I checked the PCM and TCM calibration numbers to ensure they were up to date. While I was recording the calibration numbers, I noticed that the VIN was listed in the TCM with the nonsensical string of letters “ÿÿÿÿÿÿÿÿÿÿ” across the board. 

At this point it was time to talk to the customer again and get authorization to look further into this issue. The only thing I knew at this stage was that I wanted to update the calibrations in the ECM and TCM, research why I could see no VIN in the TCM and try to figure out if this was the full extent of the issues.

The owner of the van authorized the additional time, and after a little research I came across something called “Proxi Alignment.” The function of the Proxi Alignment procedure is to copy the current vehicle configuration from the BCM to all the other modules installed on the car. Could this be the issue? I found a video from Snap-On for doing the Proxi Alignment, but they did not perform the procedure in the video because everything already showed up as “configured.” The Snap-On scanner had the Proxi configuration alignment tool located in the body control module miscellaneous functions. There was also the “check vehicle identification number” notification, and the VIN was correct for this vehicle as shown in the BCM. 

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I chose to try the Snap-On scanner first to see if that was a quick easy fix as it showed that the TCM needed to be configured. 

I followed the steps exactly as listed and it showed that the process was completed. 

Well, long story short, I still had the P0610 and P1500 codes that would not clear out. I then decided to update the calibrations in the PCM and TCM while I was still contemplating what to check next, as I’d hoped the Proxi Alignment would have fixed it. All of our locations have the WiTech 2.0 using the J2534 box as the interface, so I purchased a short-term Tech Authority subscription for programming and went ahead with reflashing those modules. 

I attempted to do the TCM first, and the dialogue said to make sure PCM was updated prior to flashing the TCM. I updated the PCM calibration and then the TCM, and all went well. The calibrations were updated, but the codes persisted. 

While using the WiTech, the Proxi Alignment is listed in the Guided Diagnostics, so I figured I would look at it with the OE scan tool. I was still hung up on this, thinking that it really makes sense that the TCM’s missing data could be the direct cause of all this. So, I repeated the PA process using the OE scanner this time, and I get to this screen:


This showed that the TCM was already configured. A dead end. Still, being stubborn I decided to keep going and get to this screen:


Now I saw, “You may still choose to align a specific ECU regardless of its status.” This was encouraging. I selected the TCM and started the procedure, and now the thing that stuck out to me was that the WiTech prompted me to turn on the radio. What?! The Snap-On tool never prompted me to turn on the radio, and in the last ten years I have programmed more than 2,000 vehicles and never once have I been prompted to turn the radio on. You can see the radio is grayed out (present but not responding) because it was not turned on. 

The procedure was completed and successful, and now the odometer stopped flashing, the shifter no longer locked, and the two configuration codes were gone.

A couple of nagging questions that I cannot 100% answer: would the Snap-On procedure have been successful if the radio was on? And why the speed sensor correlation codes? I am going to assume that the TCM did not contain the tire size data. Perhaps it was stored in the BCM, or it could be an unknown gear ratio. This transmission has a hydraulic park lock solenoid and a magnetic park lock solenoid so I must assume that when the vehicle came to a stop, the logic locked it into Park and would not release until the key was cycled.

In this case we’ve shown that some observation and utilizing two different scan tools were required in order to complete the corrective procedures on this vehicle. Sometimes the shop manuals don’t detail every needed step; the OEM scan tool had the guiding prompt where the Snap-On scan tool did not. It’s a very complicated field in which we work.

Mike Greer is an ASE-certified technician who has been in the industry since 1987 and with Certified Transmission since 1996.

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