rocker.nurse Posted July 21 Report Share Posted July 21 Happy Sunday everyone! A week ago I began having an intermittent issue on my 2014 2.4L Journey SE. • gauge indicator comes on showing the traction control is off • cannot turn traction control back on with dash button • cruise control doesn’t work when the traction control is off • car “stutters” when attempting to accelerate • check engine light on- DTC P0340 (could be very old code from head gasket fix last year) • DTC shows C121C-00 Torque Request Signal Denied • ABS dash light indicator is NOT on • we’ve cleared all codes in attempt to reset- doesn’t work • visual check shows no frayed wires or cables My stepdad is a retired mechanic so now limited on diagnostic ability but we are able to make any/all repairs if possible. Everything I’m finding mentions likely failure of the ABS but I know my Journey has a direct TCS so it doesn’t go through the ABS (which makes sense the light isn’t on). With all this said, I have 2 questions I can’t find direct answers to: 1. Is the TCS off issue directly related to the DTC code C121C-00? 2. Where in the world do we start with diagnosing? Spend the money to change out sensors? Jump to replacing the module? Any/all recommendations are appreciated! Quote Link to comment Share on other sites More sharing options...
5rebel9 Posted July 21 Report Share Posted July 21 I would suggest going after the P0340 code first, if engine{especially a 4 cyl.} is not operating properly or even intermittently, the PCM will deny trac. control and cruise control. In my understanding, you are correct in thought of it not being a wheel speed sensor or you would have codes for it. You have a high enough level scanner since it read the C121C-00 code. rocker.nurse 1 Quote Link to comment Share on other sites More sharing options...
rocker.nurse Posted July 23 Author Report Share Posted July 23 On 7/21/2024 at 6:43 PM, 5rebel9 said: I would suggest going after the P0340 code first, if engine{especially a 4 cyl.} is not operating properly or even intermittently, the PCM will deny trac. control and cruise control. In my understanding, you are correct in thought of it not being a wheel speed sensor or you would have codes for it. You have a high enough level scanner since it read the C121C-00 code. Thank you so much. I did confirm with my stepdad that the P0340 code was a permanent code that he was never able to clear after we replaced my head gasket last year. If we disregard that code, is there a way to diagnose the C121C-00 by process of elimination? Quote Link to comment Share on other sites More sharing options...
Dean H Posted July 24 Report Share Posted July 24 Code C121C-00 Quote Link to comment Share on other sites More sharing options...
Dean H Posted July 24 Report Share Posted July 24 P0340 - Scroll down for the rest. Quote Link to comment Share on other sites More sharing options...
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Dean H Posted July 24 Report Share Posted July 24 page 6 . Last page 5rebel9 1 Quote Link to comment Share on other sites More sharing options...
5rebel9 Posted July 24 Report Share Posted July 24 Thanks for posting these diagnostic charts @Dean H! This should help this member out of their problem nicely! I don't have ready access to such materials, but from my own experience would have followed such instructions anyway. But I could not explain and detail well enough to somebody else what to do. Keep up the great job here on the forum! Quote Link to comment Share on other sites More sharing options...
rocker.nurse Posted October 21 Author Report Share Posted October 21 On 7/24/2024 at 3:03 PM, 5rebel9 said: Thanks for posting these diagnostic charts @Dean H! This should help this member out of their problem nicely! I don't have ready access to such materials, but from my own experience would have followed such instructions anyway. But I could not explain and detail well enough to somebody else what to do. Keep up the great job here on the forum! Yes, thank you so much @Dean H! I’m so sorry I’m several months late posting- lots of life issues popped up. Long story short- I now have more problems than I started with. We replaced both sensors, then the Journey died while accelerating from a stoplight. It started back up and I thought it might have been a fluke/bad gas, but when I got to my parents’ house to pick up my daughter, it would not shift when starting it back up. Presently, it does not have reverse or drive, 1st gear is nonexistent, 2nd/3rd gear works BUT the power brakes do not work. Code at the time was showing P2135 and P0221. We replaced the Throttle Control Body, no difference. We replaced the battery thinking maybe it was going bad and making the electronics go crazy- no luck but now it only shows P2173, P0171, and P0507. The current lights on the dash show traction control off, the electrical lightning bolt/battery (alternating between the two), and of course- check engine. It starts right up without hesitation or issues. I checked the PCM fuse just because, why not- and the fuse is good. What’s really stumping us is no brakes, random transmission gears, and of course the new codes. Could this be a bad PCM at this point? Quote Link to comment Share on other sites More sharing options...
Dean H Posted October 21 Report Share Posted October 21 Life issues. Say no more, I know. So what all have you replaced so far? Quote Link to comment Share on other sites More sharing options...
rocker.nurse Posted October 21 Author Report Share Posted October 21 28 minutes ago, Dean H said: Life issues. Say no more, I know. So what all have you replaced so far? It’s been a never ending rollercoaster, dear lord! 2025 can’t get here soon enough. So we’ve replaced: Battery Throttle Body and gasket Cam Position Sensors (from previous post) Fuses are good Wiring is good Quote Link to comment Share on other sites More sharing options...
Dean H Posted October 21 Report Share Posted October 21 When you replace cam position sensors and the throttle body. There is a scan tool relearn function, that has to be done. Start here. Quote Link to comment Share on other sites More sharing options...
Dean H Posted October 21 Report Share Posted October 21 (edited) You need to have a bi-directional scan tool. That can communicate with all the modules and test individual components. Perform relearn procedures. I have this one- LAUNCH X431 CRP919EBT Elite... https://www.amazon.com/dp/B0C68BKGN3?ref=ppx_pop_mob_ap_share Please scan for codes and tell me exactly. What they all are right now. Edited October 22 by Dean H Quote Link to comment Share on other sites More sharing options...
Dean H Posted October 23 Report Share Posted October 23 (edited) You have an engine vacuum leak. The no power brake booster and these codes are vacuum leak related. Trace vacuum lines from the map sensor to the brake booster and the engine source. P2173- HIGH AIRFLOW/VACUUM LEAK DETECTED (SLOW ACCUMULATION) Possible Causes VACUUM LEAK RESTRICTION IN THE EXHAUST SYSTEM INTERNAL ENGINE MECHANICAL COMPONENTS RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT RESISTANCE IN THE MAP SIGNAL CIRCUIT RESISTANCE IN MAP SENSOR GROUND CIRCUIT MAP SENSOR POWERTRAIN CONTROL MODULE (PCM) Edited October 23 by Dean H Quote Link to comment Share on other sites More sharing options...
Dean H Posted October 23 Report Share Posted October 23 P0171-FUEL SYSTEM 1/1 LEAN Possible Causes RESTRICTED FUEL SUPPLY LINE FUEL PUMP INLET STRAINER PLUGGED FUEL PUMP MODULE 02 SIGNAL CIRCUIT 02 RETURN CIRCUIT 02 SENSOR MAP SENSOR ECT SENSOR ENGINE MECHANICAL FUEL FILTER/PRESSURE REGULATOR POWERTRAIN CONTROL MODULE (PCM) Quote Link to comment Share on other sites More sharing options...
2late4u Posted October 23 Report Share Posted October 23 On 7/21/2024 at 5:18 PM, rocker.nurse said: Happy Sunday everyone! A week ago I began having an intermittent issue on my 2014 2.4L Journey SE. • gauge indicator comes on showing the traction control is off • cannot turn traction control back on with dash button • cruise control doesn’t work when the traction control is off • car “stutters” when attempting to accelerate • check engine light on- DTC P0340 (could be very old code from head gasket fix last year) • DTC shows C121C-00 Torque Request Signal Denied • ABS dash light indicator is NOT on • we’ve cleared all codes in attempt to reset- doesn’t work • visual check shows no frayed wires or cables My stepdad is a retired mechanic so now limited on diagnostic ability but we are able to make any/all repairs if possible. Everything I’m finding mentions likely failure of the ABS but I know my Journey has a direct TCS so it doesn’t go through the ABS (which makes sense the light isn’t on). With all this said, I have 2 questions I can’t find direct answers to: 1. Is the TCS off issue directly related to the DTC code C121C-00? 2. Where in the world do we start with diagnosing? Spend the money to change out sensors? Jump to replacing the module? Any/all recommendations are appreciated! since the abs light is off it,shouldn't be the abs uni,t but that unit is considered a priority software code and can only be diagnosed with the higher quality scanners, I just had my abs unit replaced thur the dealership with a long backorder wait on the unit but mine had the c2200-40 code sometimes the dealership which is more expensive can come out cheaper and quicker than just throwing parts at the journey..good luck and please report back on what you find to be the problem and the fix for others Quote Link to comment Share on other sites More sharing options...
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