1997 Jeep Cherokee P1898 Code: Manufacturer-Specific Transmission Control Issue

I have a 1998 Jeep Cherokee with the same P1898 code. I've been unable to identify the root cause despite checking various sources. If anyone knows what this code means or has encountered it before, please share your findings!

Is the transmission shifting properly at all speeds and under different driving conditions?

This is a friend's vehicle. He reported that it was running fine before, but the check engine light came on. I used my OBD-II scanner to retrieve code P1898. Later, he mentioned that both the transmission and engine were replaced about a year ago. The scanner shows 'MANUFACTURER CONTROL TRANSMISSION' — no online documentation exists for this specific code. Any help would be appreciated.

I recommend using a dealer-level scan tool or one that provides detailed diagnostic information beyond just the code number. While I can try to look up the definition, it may take some time due to limited public data on this specific P1898 code.

I'm having trouble finding any official documentation for P1898. Could it be possible that my scanner is misreading the code? I'd like to confirm whether this is a genuine OBD-II error or a display issue.

On my Actron DTC Lookup, P0700 is listed as 'Transmission Control System Malfunction' with an EATX fault present. I couldn't find any information on P1898 either. If the transmission shifts normally, it might point to a transfer case control switch or wiring issue. Still, this code should be investigated further.

Just to confirm — is this a Cherokee or a Grand Cherokee? Either way, I suspect P1898 may be a typo and you might actually mean P1698. The P1698 code is known as an EEPROM error, often occurring when communication fails between modules on the bus line. This issue can vary by model year. My suggestion: have it scanned with a dealer-level tool to retrieve the full 2-digit hex code for more accurate diagnosis. If the transmission shifts fine but the code persists, it's still worth investigating. If the code clears, keep an eye on the transmission for any signs of trouble.

I also have P1898 and P0700 on my 1997 Cherokee. The vehicle runs and shifts normally. I recently replaced all shift solenoids due to shifting issues. My odometer shows two-digit hex codes: 12, 45, 55. After checking alldatadiy.com, code 45 corresponds to several transmission-related faults: - P1762 (TC-169): Governor pressure sensor voltage too low/high - P1763 (TC-168): Governor pressure sensor voltage too high - P1764 (TC-167): Governor pressure sensor voltage too low - n/a (TC-188): O/D switch stuck in park or gear - P1899 (TC-114): Park/Neutral switch stuck in park or gear - P0713 (TC-75): Transmission temperature sensor voltage too high - P0712 (TC-74): Transmission temperature sensor voltage too low - P0711 (TC-164): No temperature rise after start While this doesn't directly explain P1898, it shows how similar codes relate to transmission control. I believe generic OBD-II tools may not read all P07xx codes unless they have direct communication with the TCM. This might be a limitation of standard scanners.

Try visiting a reputable transmission shop that uses a scan tool capable of accessing the TCM (Transmission Control Module) and reading powertrain sensor data for more accurate diagnostics.