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Fuel Pressure Sensor & P1457 code

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ZZDan

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Discussion starter · #1 ·
Helping my Dad with his 2016 Jeep Patriot. Engine light has been on for months. First garage couldn't find anything. Messed with new gas cap, sealing grease did nothing. 2nd garage found the sensor was always at a value of 8? Dropped the tank to change the sensor - first question: Was that really necessary? I thought it was on the top next to the fuel pump. I got a Haynes Repair Manual from the library but this is an annoying book that I finally found won't even get near any emissions stuff.

Back to the 2nd garage again (ran out of time last visit) they found a BRN/TAN wire that they said should be grounded but isn't. The writeup says they would "need to change the fuse box" I found that they soldered a wire at the PCM in the engine - I didn't want to disturb the wires so I'm not sure if that's actually the BRN/TAN one. Second question: Is that wire somehow part of the "fuse box" They said it passed the emissions check but it still needs tires before it would pass inspection (not due until next month). I saw a nice diagram over on another post - guess I can't link it here.=

Thanks in advance for any opinions / information!
 
#2 ·
ZZDan said:
Was that really necessary? I thought it was on the top next to the fuel pump.
Click to expand...
The sensor is part of an in-line assembly (2012+) that's above / behind the fuel tank, and there's apparently no access through the cabin from above. They might have been able to do it without dropping the tank, but would have probably been harder:




ZZDan said:
Is that wire somehow part of the "fuse box"
Click to expand...
Per the diagram from the service manual, that wire runs from the sensor to the PCM, it doesn't go to the fuse box / TIPM.

Image
 
Discussion starter · #3 ·
Sandstone said:
The sensor is part of an in-line assembly (2012+) that's above / behind the fuel tank, and there's apparently no access through the cabin from above. They might have been able to do it without dropping the tank, but would have probably been harder:






Per the diagram from the service manual, that wire runs from the sensor to the PCM, it doesn't go to the fuse box / TIPM.

View attachment 101014
Click to expand...
Sandstone said:
The sensor is part of an in-line assembly (2012+) that's above / behind the fuel tank, and there's apparently no access through the cabin from above. They might have been able to do it without dropping the tank, but would have probably been harder:






Per the diagram from the service manual, that wire runs from the sensor to the PCM, it doesn't go to the fuse box / TIPM.

View attachment 101014
Click to expand...
Thanks so much! That garage seems to be trying to save my Dad money. Unfortunately, there's been quite a bit of time and money spent and the check engine light is still on. At least this diagram shows BR/TN as a return so that fits together. Is changing that wire harness impossible? It's not a leak because I've never seen the P0455/0456 codes
 
#4 ·
ZZDan said:
Is changing that wire harness impossible?
Click to expand...
Not impossible but I'd expect more cost.

If the CEL is still on, I'd check to see if it's the same code or if there's something else.

According to the service manual, P1457 takes one fault to set the code and three good trips to clear it.

You may need to run through a drive cycle to reset it:
antiochstarsmogcheck.com

Chrysler Drive Cycle - ODB2 Readiness Monitors - A Star Smog - Antioch Smog Check

In order to determine if your Jeep, Dodge, or Chrysler vehicle is ready for an emissions test, you can either use an OBDII scanner or, if one is not available, check the MIL (check engine light). At A Star Smog, we will use an OBDII scanner to conduct a smog precheck. Turn on the ignition ...
antiochstarsmogcheck.com antiochstarsmogcheck.com
 
Discussion starter · #7 ·
Sandstone said:
Not impossible but I'd expect more cost.

If the CEL is still on, I'd check to see if it's the same code or if there's something else.

According to the service manual, P1457 takes one fault to set the code and three good trips to clear it.

You may need to run through a drive cycle to reset it:
antiochstarsmogcheck.com

Chrysler Drive Cycle - ODB2 Readiness Monitors - A Star Smog - Antioch Smog Check

In order to determine if your Jeep, Dodge, or Chrysler vehicle is ready for an emissions test, you can either use an OBDII scanner or, if one is not available, check the MIL (check engine light). At A Star Smog, we will use an OBDII scanner to conduct a smog precheck. Turn on the ignition ...
antiochstarsmogcheck.com antiochstarsmogcheck.com
Click to expand...
Good to know about taking 3 trips to clear. I'm not with the vehicle so I don't know if it went off. Maybe the garage knew the sensor input had been fixed. But they said the light would probably come back on. Is the EVAP solenoid a suspect because they never touched that. Since the code says "tank pressure too high" it seems to follow that the solenoid is what controls that pressure.
 
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