Question about Hyundai Elantra

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1997 Hyundai Elantra codes P1128, P0455 and P0707. Car seems to be stuck in 3rd gear. Check engine light on. Doesn't want to accelerate, sometimes the pedal goes all the way to the floor when accelerating from a stop, and nothing happens. Then it kicks in and starts moving, very slowly, but the rpms go up. Bucking and hesitating while moving. Can't give it too much gas from a stop, or it just bogs. Have to push the accelerator very slowly. Once I can get it moving, seems fine on the highway, at a constant speed, but revs very high. When I can get it to run, I'm red-lining at 65 mph, around 4000 rps. Fuel smell inside and outside of the car after fill ups. Please advise, and thanks in advance!

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Hi, the trouble codes P1128, P0455 and P0707 is a summary of all the problems your are currently experiencing with the car and each code will be explained in details below...

P0455 This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

P0707 The park/neutral position (PNP) switch includes a transmission range switch. The transmission range switch detects the selector lever position when the shift lever is in the N or P shift position and sends a signal to the Transmission Control Module (TCM).

- Open or short park/neutral position switch circuit
- Poor park/neutral position switch circuit connection
- Misadjusted park/neutral position switch
- Park/neutral position switch may be faulty

Code P1128 is a lean condition code. The engine computer may be reducing boost to protect itself. Assuming the parts you have replaced are in good working condition I would check the fuel pressure (pump failing?) check the oxygen sensors (switching throughout full range?) and check the operation of the fuel injectors (not spraying correctly).

Posted on Apr 01, 2011

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2001 Hyundai elantra - trouble codes P0442,P0507,P0455 and NO DTC

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2002 Hyundai Elantra Check Engine Light with OBD code P0455.

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I have a 2001 Elantra GT. with the auto trans in drive the trans slips when I'm doing 50-65 mph and the trans is in 4th gear if i have my foot to heavy on the gas. it doesn't do it as bad if I have...

First of all, Hyundai Transmissions use a 'specific' fluid called 'SPIII' and ONLY SPIII. Any other fluid doesn't meet Hyundai's specification and can cause 4th gear slippage (which is the TTC - Torque Converter Clutch - frequently referred to as the "lock-up" converter). You should have had a Check Engine Light. The problem you describe regarding 'doesn't drop back to first when I'm at a stop' sounds like the transmission has gone into 'Fail-Safe' mode because of the 4th gear ration incorrect. In "Fail-Safe" mode, the trans stays in 3rd gear until you cycle the ignition key off, and then back on. You need to scan your engine's computer to see what/which trouble codes have been set/stored in it. You'll need an OBDII scanner to read any codes that might be there. When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this/these code(s), you can begin diagnosis.

Sep 07, 2011 | 2001 Hyundai Elantra

1 Answer

Daughter has a 1997 Hyundai Elantra that she bought used, it has over 200,000 miles. Runs sluggish and has no power when you attempt to accelerate. Have replaced plugs, wires, ignition coil, catalytic...

200K is a lot of miles. I would think that the rings might not be in very good shape.

Take the oil filler cap off. Stand to the side of the vehicle. Put the car in gear push hard on the brakes, and push on the accelerator to ask a lot of power from the engine. If you get exhaust gas coming out of the oil filling hole, your piston rings are history.

See if that “stuck” code is back, and find out what the code is saying.

I had a 96 Hyundai that got to the point that no acceleration was possible. As it turned out, there were two catalytic converters, one in a coffee can shaped section of the exhaust manifold, and one a lot farther down the tail pipe. It turns out that the face of the first converter had actually melted from the exhaust heat, and the face had seeped over the whole front of that converter, blocking any chance for exhaust to flow through it. My first clue was when I disconnected the exhaust pipe from the manifold, then started the car. There was no loud exhaust noise! (I thought I had lost my mind!) I don't actually think you have this problem, because resetting a code cannot overcome that kind of problem.

Having the exhaust gas analyzed while the engine is under a load might reveal something meaningful.

Jun 23, 2010 | 1997 Hyundai Elantra

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Transmission Problems on 2001 Elantra

what can i do to fix the output speed sensor

Jun 22, 2010 | 2001 Hyundai Elantra

1 Answer

Trouble code 1997 Hyundai Elantra, P1128

P1128 trouble code is for (Upstream Heated O2 Sensors Swapped). Did you switch around any of the O2 sensors?

Apr 24, 2010 | 1997 Hyundai Elantra

1 Answer

Code 1529

Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. P1529 is a TCM MIL request to the
TCM = Transmission Control Module. The sluggishness is really what is known as 'fail safe' mode (3rd gear). You should have had other codes besides P1529 to identify which system in the transmission caused the problem.

Nov 02, 2009 | 2001 Hyundai Elantra

2 Answers

Hi, I have a Hyndai Elantra and the engine light

Apparently so - P0501 is a speed sensor code,
FAILURE CONDITIONS The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if there is no vehicle speed sensor output signal for 20 seconds during two driving cycles when the following conditions are met: a. Open between fuse and wheel speed sensor (WSS) b. Open between WSS and GND c. Open between WSS and ECM d. Short to battery or GND between WSS and ECM e. Faulty WSS However, the other, P-456 is an EVAP system code: a. Fuel filler cap loose or missing b. Fuel filler cap o-ring missing or damaged c. Faulty or damaged fuel filler pipe d. Leaking, disconnected or plugged fuel vapor lines e. Fuel in lines due to faulty rollover valve, on-board refueling vapor recovery valve or stuck closed CCV f. Canister close valve clogged, stuck open or closed g. Improperly installed purge solenoid valve h. PSV stuck open or closed i. Faulty fuel tank pressure sensor j. Leaking canister or catch tank a. If any codes relating to FTPS, CCV or PSV circuits are present, do all repairs associated with those codes before proceeding with this troubles area. b. If DTC P0455 is stored and MIL is illuminated, before proceeding to evaporative system test and repair, verify whether the customer was running the engine during refueling. c. If an obvious cause for DTC P0455 is an engine running during refueling, erase the DTC P0455 using Hi-Scan and do not repair the evaporative system. However, the vehicle should be monitored to find reoccurrence of the concern which may come from actual evaporative system.

Jun 13, 2009 | Hyundai Motor 2002 Elantra

1 Answer

What does code number P1128 mean when light is on

P1128 - Long Term Fuel Trim Multiplicative System Too Lean.
The ECM will set a code and the MIL will turn on if the long-term fuel trim value goes from 10% to 15% lean for 30 seconds during two driving cycles when the following conditions are met:
1.- Engine loads exceeds 1.8 milliseconds.
2.- Engine coolant temp. is above 158F (70C).
3.- Canister purge system is not operating.
4.- Mass air flow is less than or equal to 5.5grams per second.
5.- Engine speed is below 1000RPM.

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Transmission on my 2001 Hyundai Elantra GLS

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